diff --git a/.github/workflows/push-github-actions.yml b/.github/workflows/push-github-actions.yml
index d7084499f5..cf5d224358 100644
--- a/.github/workflows/push-github-actions.yml
+++ b/.github/workflows/push-github-actions.yml
@@ -66,7 +66,7 @@ jobs:
             # Now, add the generated files
             git add -A dist/ &&
             # Remove the rest
-            git rm -r -- \* ':(exclude)dist/' ':(exclude)*/action.yml' ':(exclude)*/index.js' &&
+            git rm -r -- \* ':(exclude)dist/' ':(exclude)*/action.yml' ':(exclude)*/index.js' ':(exclude)*/post.js' &&
 
             # Now make that fake merge commit
             tree=$(git write-tree) &&
diff --git a/.vscode/settings.json b/.vscode/settings.json
index e51062ffc9..8bcacc2e87 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -83,6 +83,7 @@
         "tbdiff",
         "Thái",
         "Truthy",
+        "typia",
         "unportable",
         "vger",
         "VSTS",
diff --git a/check-run/action.yml b/check-run/action.yml
new file mode 100644
index 0000000000..610c7a9319
--- /dev/null
+++ b/check-run/action.yml
@@ -0,0 +1,53 @@
+name: 'Create or update a Check Run'
+description: 'Mirrors a workflow run to a Check Run of a Pull Request in a different repository'
+author: 'Johannes Schindelin'
+inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
+  pr-repo-token:
+    description: 'The access token to work on the repository that holds PRs and state'
+    required: true
+  upstream-repo-token:
+    description: 'The access token to work on PRs in the upstream repository'
+    required: false
+  test-repo-token:
+    description: 'The access token to work on PRs in the test repository'
+    required: false
+  pr-url:
+    description: 'The URL of the Pull Request (or Pull Request comment)'
+    required: false
+  check-run-id:
+    description: 'The Check Run to update (if empty, a new one will be created)'
+    default: ''
+  name:
+    description: 'The name of the CheckRun (required if check-run-id is empty)'
+    default: ''
+  title:
+    description: 'The Check Run title (required when creating a new one)'
+    default: ''
+  summary:
+    description: 'The Check Run summary (required when creating a new one)'
+    default: ''
+  text:
+    description: 'The Check Run text (required when creating a new one)'
+    default: ''
+  details-url:
+    description: 'The details URL of the Check Run (required when creating a new one)'
+    default: '${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}'
+  conclusion:
+    description: 'If set, the Check Run will be marked as completed'
+    default: ''
+  job-status:
+    description: 'Needed at the end of the job'
+    default: ${{ job.status }}
+outputs:
+  check-run-id:
+    description: 'The ID of the created or updated Check Run'
+runs:
+  using: 'node20'
+  main: './index.js'
+  post: './post.js'
+branding:
+  icon: 'git-commit'
+  color: 'orange'
\ No newline at end of file
diff --git a/check-run/index.js b/check-run/index.js
new file mode 100644
index 0000000000..5706cf3c1f
--- /dev/null
+++ b/check-run/index.js
@@ -0,0 +1,13 @@
+async function run() {
+  const { CIHelper } = await import("../dist/index.js")
+
+  try {
+    const ci = new CIHelper()
+    ci.setupGitHubAction({ createOrUpdateCheckRun: true })
+  } catch (e) {
+    console.error(e)
+    process.exitCode = 1
+  }
+}
+
+run()
diff --git a/check-run/post.js b/check-run/post.js
new file mode 100644
index 0000000000..3682f8fca8
--- /dev/null
+++ b/check-run/post.js
@@ -0,0 +1,13 @@
+async function run() {
+  const { CIHelper } = await import("../dist/index.js")
+
+  try {
+    const ci = new CIHelper()
+    ci.setupGitHubAction({ createOrUpdateCheckRun: "post" })
+  } catch (e) {
+    console.error(e)
+    process.exitCode = 1
+  }
+}
+
+run()
diff --git a/handle-new-mails/action.yml b/handle-new-mails/action.yml
index 23dc2676cb..7f35716860 100644
--- a/handle-new-mails/action.yml
+++ b/handle-new-mails/action.yml
@@ -2,6 +2,9 @@ name: 'Handle new mails'
 description: 'Processes new mails on the Git mailing list'
 author: 'Johannes Schindelin'
 inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
   pr-repo-token:
     description: 'The access token to work on the repository that holds PRs and state'
     required: true
diff --git a/handle-pr-comment/action.yml b/handle-pr-comment/action.yml
index 564bd7dfd1..c9b65bc961 100644
--- a/handle-pr-comment/action.yml
+++ b/handle-pr-comment/action.yml
@@ -2,6 +2,9 @@ name: 'Handle PR Comment'
 description: 'Handles slash commands such as /submit and /preview'
 author: 'Johannes Schindelin'
 inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
   pr-repo-token:
     description: 'The access token to work on the repository that holds PRs and state'
     required: true
diff --git a/handle-pr-comment/index.js b/handle-pr-comment/index.js
index d330752030..0667313504 100644
--- a/handle-pr-comment/index.js
+++ b/handle-pr-comment/index.js
@@ -2,10 +2,10 @@ async function run() {
   const { CIHelper } = await import("../dist/index.js")
 
   const ci = new CIHelper()
-  const { owner, commentId } = ci.parsePRCommentURLInput()
+  const { owner, comment_id } = ci.parsePRCommentURLInput()
 
   await ci.setupGitHubAction()
-  await ci.handleComment(owner, commentId)
+  await ci.handleComment(owner, comment_id)
 }
 
 run()
diff --git a/handle-pr-push/action.yml b/handle-pr-push/action.yml
index e5b74c8e0c..15eab3879f 100644
--- a/handle-pr-push/action.yml
+++ b/handle-pr-push/action.yml
@@ -2,6 +2,9 @@ name: 'Handle PR Pushes'
 description: 'Handles when a PR was pushed'
 author: 'Johannes Schindelin'
 inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
   pr-repo-token:
     description: 'The access token to work on the repository that holds PRs and state'
     required: true
diff --git a/handle-pr-push/index.js b/handle-pr-push/index.js
index 91f594e976..446181eb12 100644
--- a/handle-pr-push/index.js
+++ b/handle-pr-push/index.js
@@ -2,10 +2,10 @@ async function run() {
   const { CIHelper } = await import("../dist/index.js")
 
   const ci = new CIHelper()
-  const { owner, prNumber } = ci.parsePRURLInput()
+  const { owner, pull_number } = ci.parsePRURLInput()
 
   await ci.setupGitHubAction()
-  await ci.handlePush(owner, prNumber)
+  await ci.handlePush(owner, pull_number)
 }
 
 run()
diff --git a/lib/ci-helper.ts b/lib/ci-helper.ts
index 43b763fe5c..34ae748171 100644
--- a/lib/ci-helper.ts
+++ b/lib/ci-helper.ts
@@ -1,6 +1,7 @@
 import * as core from "@actions/core";
 import * as fs from "fs";
 import * as os from "os";
+import typia from "typia";
 import * as util from "util";
 import { spawnSync } from "child_process";
 import addressparser from "nodemailer/lib/addressparser/index.js";
@@ -10,14 +11,27 @@ import { commitExists, git, emptyTreeName, revParse } from "./git.js";
 import { GitNotes } from "./git-notes.js";
 import { GitGitGadget, IGitGitGadgetOptions } from "./gitgitgadget.js";
 import { getConfig } from "./gitgitgadget-config.js";
-import { GitHubGlue, IGitHubUser, IPRComment, IPRCommit, IPullRequestInfo, RequestError } from "./github-glue.js";
+import {
+    ConclusionType,
+    GitHubGlue,
+    IGitHubUser,
+    IPRComment,
+    IPRCommit,
+    IPullRequestInfo,
+    RequestError,
+} from "./github-glue.js";
 import { toPrettyJSON } from "./json-util.js";
 import { MailArchiveGitHelper } from "./mail-archive-helper.js";
 import { MailCommitMapping } from "./mail-commit-mapping.js";
 import { IMailMetadata } from "./mail-metadata.js";
 import { IPatchSeriesMetadata } from "./patch-series-metadata.js";
 import { IConfig, getExternalConfig, setConfig } from "./project-config.js";
-import { getPullRequestKeyFromURL, pullRequestKey } from "./pullRequestKey.js";
+import {
+    getPullRequestCommentKeyFromURL,
+    getPullRequestKeyFromURL,
+    getPullRequestOrCommentKeyFromURL,
+    pullRequestKey,
+} from "./pullRequestKey.js";
 import { ISMTPOptions } from "./send-mail.js";
 import { fileURLToPath } from "url";
 
@@ -53,8 +67,24 @@ export class CIHelper {
         return configFile ? await getExternalConfig(configFile) : getConfig();
     }
 
+    public static validateConfig = typia.createValidate<IConfig>();
+
+    protected static getConfigAsGitHubActionInput(): IConfig | undefined {
+        if (process.env.GITHUB_ACTIONS !== "true") return undefined;
+        const json = core.getInput("config");
+        if (!json) return undefined;
+        const config = JSON.parse(json) as IConfig | undefined;
+        const result = CIHelper.validateConfig(config);
+        if (result.success) return config;
+        throw new Error(
+            `Invalid config:\n- ${result.errors
+                .map((e) => `${e.path} (value: ${e.value}, expected: ${e.expected}): ${e.description}`)
+                .join("\n- ")}`,
+        );
+    }
+
     public constructor(workDir: string = "pr-repo.git", config?: IConfig, skipUpdate?: boolean, gggConfigDir = ".") {
-        this.config = config !== undefined ? setConfig(config) : getConfig();
+        this.config = config !== undefined ? setConfig(config) : CIHelper.getConfigAsGitHubActionInput() || getConfig();
         this.gggConfigDir = gggConfigDir;
         this.workDir = workDir;
         this.notes = new GitNotes(workDir);
@@ -72,24 +102,8 @@ export class CIHelper {
         needsMailingListMirror?: boolean;
         needsUpstreamBranches?: boolean;
         needsMailToCommitNotes?: boolean;
+        createOrUpdateCheckRun?: boolean | "post";
     }): Promise<void> {
-        // help dugite realize where `git` is...
-        const gitExecutable = os.type() === "Windows_NT" ? "git.exe" : "git";
-        const stripSuffix = `bin${path.sep}${gitExecutable}`;
-        for (const gitPath of (process.env.PATH || "/")
-            .split(path.delimiter)
-            .map((p) => path.normalize(`${p}${path.sep}${gitExecutable}`))
-            // eslint-disable-next-line security/detect-non-literal-fs-filename
-            .filter((p) => p.endsWith(`${path.sep}${stripSuffix}`) && fs.existsSync(p))) {
-            process.env.LOCAL_GIT_DIRECTORY = gitPath.substring(0, gitPath.length - stripSuffix.length);
-            // need to override GIT_EXEC_PATH, so that Dugite can find the `git-remote-https` executable,
-            // see https://github.com/desktop/dugite/blob/v2.7.1/lib/git-environment.ts#L44-L64
-            // Also: We cannot use `await git(["--exec-path"]);` because that would use Dugite, which would
-            // override `GIT_EXEC_PATH` and then `git --exec-path` would report _that_...
-            process.env.GIT_EXEC_PATH = spawnSync(gitPath, ["--exec-path"]).stdout.toString("utf-8").trimEnd();
-            break;
-        }
-
         // configure the Git committer information
         process.env.GIT_CONFIG_PARAMETERS = [
             process.env.GIT_CONFIG_PARAMETERS,
@@ -101,7 +115,7 @@ export class CIHelper {
 
         // get the access tokens via the inputs of the GitHub Action
         this.setAccessToken(this.config.repo.owner, core.getInput("pr-repo-token"));
-        this.setAccessToken(this.config.repo.baseOwner, core.getInput("upstream-repo-token"));
+        this.setAccessToken(this.config.repo.upstreamOwner, core.getInput("upstream-repo-token"));
         if (this.config.repo.testOwner) {
             this.setAccessToken(this.config.repo.testOwner, core.getInput("test-repo-token"));
         }
@@ -121,6 +135,27 @@ export class CIHelper {
             // Ignore, for now
         }
 
+        if (setupOptions?.createOrUpdateCheckRun) {
+            return await this.createOrUpdateCheckRun(setupOptions.createOrUpdateCheckRun === "post");
+        }
+
+        // help dugite realize where `git` is...
+        const gitExecutable = os.type() === "Windows_NT" ? "git.exe" : "git";
+        const stripSuffix = `bin${path.sep}${gitExecutable}`;
+        for (const gitPath of (process.env.PATH || "/")
+            .split(path.delimiter)
+            .map((p) => path.normalize(`${p}${path.sep}${gitExecutable}`))
+            // eslint-disable-next-line security/detect-non-literal-fs-filename
+            .filter((p) => p.endsWith(`${path.sep}${stripSuffix}`) && fs.existsSync(p))) {
+            process.env.LOCAL_GIT_DIRECTORY = gitPath.substring(0, gitPath.length - stripSuffix.length);
+            // need to override GIT_EXEC_PATH, so that Dugite can find the `git-remote-https` executable,
+            // see https://github.com/desktop/dugite/blob/v2.7.1/lib/git-environment.ts#L44-L64
+            // Also: We cannot use `await git(["--exec-path"]);` because that would use Dugite, which would
+            // override `GIT_EXEC_PATH` and then `git --exec-path` would report _that_...
+            process.env.GIT_EXEC_PATH = spawnSync(gitPath, ["--exec-path"]).stdout.toString("utf-8").trimEnd();
+            break;
+        }
+
         // eslint-disable-next-line security/detect-non-literal-fs-filename
         if (!fs.existsSync(this.workDir)) await git(["init", "--bare", "--initial-branch", "unused", this.workDir]);
         for (const [key, value] of [
@@ -128,7 +163,7 @@ export class CIHelper {
             ["remote.origin.url", `https://github.com/${this.config.repo.owner}/${this.config.repo.name}`],
             ["remote.origin.promisor", "true"],
             ["remote.origin.partialCloneFilter", "blob:none"],
-            ["remote.upstream.url", `https://github.com/${this.config.repo.baseOwner}/${this.config.repo.name}`],
+            ["remote.upstream.url", `https://github.com/${this.config.repo.upstreamOwner}/${this.config.repo.name}`],
             ["remote.upstream.promisor", "true"],
             ["remote.upstream.partialCloneFilter", "blob:none"],
         ]) {
@@ -175,7 +210,7 @@ export class CIHelper {
             console.time("get open PR head commits");
             const openPRCommits = (
                 await Promise.all(
-                    this.config.repo.owners.map(async (repositoryOwner) => {
+                    this.config.app.installedOn.map(async (repositoryOwner) => {
                         return await this.github.getOpenPRs(repositoryOwner);
                     }),
                 )
@@ -252,24 +287,79 @@ export class CIHelper {
         }
     }
 
-    public parsePRCommentURLInput(): { owner: string; repo: string; prNumber: number; commentId: number } {
-        const prCommentUrl = core.getInput("pr-comment-url");
-        const [, owner, repo, prNumber, commentId] =
-            prCommentUrl.match(/^https:\/\/github\.com\/([^/]+)\/([^/]+)\/pull\/(\d+)#issuecomment-(\d+)$/) || [];
-        if (!this.config.repo.owners.includes(owner) || repo !== this.config.repo.name) {
-            throw new Error(`Invalid PR comment URL: ${prCommentUrl}`);
+    protected async createOrUpdateCheckRun(runPost: boolean): Promise<void> {
+        type CheckRunParameters = {
+            owner: string;
+            repo: string;
+            pull_number: number;
+            check_run_id?: number;
+            name: string;
+            output?: {
+                title: string;
+                summary: string;
+                text?: string;
+            };
+            details_url?: string;
+            conclusion?: ConclusionType;
+            job_status?: ConclusionType;
+        };
+        const params = JSON.parse(core.getState("check-run") || "{}") as CheckRunParameters;
+
+        const validateCheckRunParameters = () => {
+            const result = typia.createValidate<CheckRunParameters>()(params);
+            if (!result.success) {
+                throw new Error(
+                    `Invalid check-run state:\n- ${result.errors
+                        .map((e) => `${e.path} (value: ${e.value}, expected: ${e.expected}): ${e.description}`)
+                        .join("\n- ")}`,
+                );
+            }
+        };
+        if (Object.keys(params).length) validateCheckRunParameters();
+
+        ["pr-url", "check-run-id", "name", "title", "summary", "text", "details-url", "conclusion", "job-status"]
+            .map((name) => [name.replaceAll("-", "_"), core.getInput(name)] as const)
+            .forEach(([key, value]) => {
+                if (!value) return;
+                if (key === "pr_url") Object.assign(params, getPullRequestOrCommentKeyFromURL(value));
+                else if (key === "check_run_id") params.check_run_id = Number.parseInt(value, 10);
+                else if (key === "title" || key === "summary" || key === "text") {
+                    if (!params.output) Object.assign(params, { output: {} });
+                    (params.output as { [key: string]: string })[key] = value;
+                } else (params as unknown as { [key: string]: string })[key] = value;
+            });
+        validateCheckRunParameters();
+
+        if (runPost) {
+            if (!params.check_run_id) {
+                core.info("No Check Run ID found in state; doing nothing");
+                return;
+            }
+            if (!params.conclusion) {
+                Object.assign(params, { conclusion: params.job_status });
+                validateCheckRunParameters();
+            }
+        }
+
+        if (params.check_run_id === undefined) {
+            ({ id: params.check_run_id } = await this.github.createCheckRun(params));
+            core.setOutput("check-run-id", params.check_run_id);
+        } else {
+            await this.github.updateCheckRun({
+                ...params,
+                // needed to pacify TypeScript's concerns about the ID being potentially undefined
+                check_run_id: params.check_run_id,
+            });
         }
-        return { owner, repo, prNumber: parseInt(prNumber, 10), commentId: parseInt(commentId, 10) };
+        core.exportVariable("STATE_check-run", JSON.stringify(params));
     }
 
-    public parsePRURLInput(): { owner: string; repo: string; prNumber: number } {
-        const prUrl = core.getInput("pr-url");
+    public parsePRCommentURLInput(): { owner: string; repo: string; pull_number: number; comment_id: number } {
+        return getPullRequestCommentKeyFromURL(core.getInput("pr-comment-url"));
+    }
 
-        const [, owner, repo, prNumber] = prUrl.match(/^https:\/\/github\.com\/([^/]+)\/([^/]+)\/pull\/(\d+)$/) || [];
-        if (!this.config.repo.owners.includes(owner) || repo !== this.config.repo.name) {
-            throw new Error(`Invalid PR URL: ${prUrl}`);
-        }
-        return { owner, repo, prNumber: parseInt(prNumber, 10) };
+    public parsePRURLInput(): { owner: string; repo: string; pull_number: number } {
+        return getPullRequestKeyFromURL(core.getInput("pr-url"));
     }
 
     public setAccessToken(repositoryOwner: string, token: string): void {
@@ -411,7 +501,7 @@ export class CIHelper {
                 mailMeta.originalCommit,
                 upstreamCommit,
                 this.config.repo.owner,
-                this.config.repo.baseOwner,
+                this.config.repo.upstreamOwner,
             );
         }
 
@@ -654,7 +744,7 @@ export class CIHelper {
 
                 // Add comment on GitHub
                 const comment = `This patch series was integrated into ${branch} via https://github.com/${
-                    this.config.repo.baseOwner
+                    this.config.repo.upstreamOwner
                 }/${this.config.repo.name}/commit/${mergeCommit}.`;
                 const url = await this.github.addPRComment(prKey, comment);
                 console.log(`Added comment ${url.id} about ${branch}: ${url.url}`);
@@ -892,7 +982,7 @@ export class CIHelper {
                     await addComment(
                         `Submitted as [${
                             metadata?.coverLetterMessageId
-                        }](https://${this.config.mailrepo.host}/${this.config.mailrepo.name}/${
+                        }](${this.config.mailrepo.url.replace(/\/+$/, "")}/${
                             metadata?.coverLetterMessageId
                         })\n\nTo fetch this version into \`FETCH_HEAD\`:${
                             code
@@ -1020,7 +1110,7 @@ export class CIHelper {
 
         if (result) {
             const results = commits.map((commit: IPRCommit) => {
-                const linter = new LintCommit(commit);
+                const linter = new LintCommit(commit, this.config.lint.commitLintOptions);
                 return linter.lint();
             });
 
@@ -1137,7 +1227,7 @@ export class CIHelper {
         const handledPRs = new Set<string>();
         const handledMessageIDs = new Set<string>();
 
-        for (const repositoryOwner of this.config.repo.owners) {
+        for (const repositoryOwner of this.config.app.installedOn) {
             const pullRequests = await this.github.getOpenPRs(repositoryOwner);
 
             for (const pr of pullRequests) {
@@ -1195,7 +1285,7 @@ export class CIHelper {
     private async getPRInfo(prKey: pullRequestKey): Promise<IPullRequestInfo> {
         const pr = await this.github.getPRInfo(prKey);
 
-        if (!this.config.repo.owners.includes(pr.baseOwner) || pr.baseRepo !== this.config.repo.name) {
+        if (!this.config.app.installedOn.includes(pr.baseOwner) || pr.baseRepo !== this.config.repo.name) {
             throw new Error(`Unsupported repository: ${pr.pullRequestURL}`);
         }
 
diff --git a/lib/commit-lint.ts b/lib/commit-lint.ts
index 3eab1f22cf..7e046d7538 100644
--- a/lib/commit-lint.ts
+++ b/lib/commit-lint.ts
@@ -5,7 +5,7 @@ export interface ILintError {
     message: string;
 }
 
-export interface ILintOptions {
+export interface ILintCommitConfig {
     maxColumns?: number | undefined; // max line length
 }
 
@@ -19,7 +19,7 @@ export class LintCommit {
     private messages: string[] = [];
     private maxColumns = 76;
 
-    public constructor(patch: IPRCommit, options?: ILintOptions) {
+    public constructor(patch: IPRCommit, options?: ILintCommitConfig) {
         this.blocked = false;
         this.lines = patch.message.split("\n");
         this.patch = patch;
diff --git a/lib/gitgitgadget-config.ts b/lib/gitgitgadget-config.ts
index 47ba1eb16d..5144094aba 100644
--- a/lib/gitgitgadget-config.ts
+++ b/lib/gitgitgadget-config.ts
@@ -4,9 +4,8 @@ const defaultConfig: IConfig = {
     repo: {
         name: "git",
         owner: "gitgitgadget",
-        baseOwner: "git",
+        upstreamOwner: "git",
         testOwner: "dscho",
-        owners: ["gitgitgadget", "git", "dscho"],
         branches: ["maint", "seen"],
         closingBranches: ["maint", "master"],
         trackingBranches: ["maint", "seen", "master", "next"],
@@ -27,6 +26,8 @@ const defaultConfig: IConfig = {
     mail: {
         author: "GitGitGadget",
         sender: "GitGitGadget",
+        smtpUser: "gitgitgadget@gmail.com",
+        smtpHost: "smtp.gmail.com",
     },
     app: {
         appID: 12836,
@@ -34,6 +35,7 @@ const defaultConfig: IConfig = {
         name: "gitgitgadget",
         displayName: "GitGitGadget",
         altname: "gitgitgadget-git",
+        installedOn: ["gitgitgadget", "git", "dscho"],
     },
     lint: {
         maxCommitsIgnore: ["https://github.com/gitgitgadget/git/pull/923"],
@@ -42,6 +44,18 @@ const defaultConfig: IConfig = {
     user: {
         allowUserAsLogin: false,
     },
+    syncUpstreamBranches: [
+        {
+            sourceRepo: "gitster/git",
+            targetRepo: "gitgitgadget/git",
+            sourceRefRegex: "^refs/heads/(maint-\\d|[a-z][a-z]/)",
+        },
+        {
+            sourceRepo: "j6t/git-gui",
+            targetRepo: "gitgitgadget/git",
+            targetRefNamespace: "git-gui/",
+        },
+    ],
 };
 
 export default defaultConfig;
diff --git a/lib/github-glue.ts b/lib/github-glue.ts
index a20e0af38c..ca7900e139 100644
--- a/lib/github-glue.ts
+++ b/lib/github-glue.ts
@@ -51,6 +51,17 @@ export interface IGitHubUser {
     type: string;
 }
 
+export type ConclusionType =
+    | "action_required"
+    | "cancelled"
+    | "failure"
+    | "neutral"
+    | "success"
+    | "skipped"
+    | "stale"
+    | "timed_out"
+    | undefined;
+
 export class GitHubGlue {
     public workDir: string;
     protected client: Octokit = new Octokit(); // add { log: console } to debug
@@ -477,6 +488,60 @@ export class GitHubGlue {
         this.tokens.set(repositoryOwner, token);
     }
 
+    public async createCheckRun(options: {
+        owner: string;
+        repo: string;
+        pull_number: number;
+        name: string;
+        output?: {
+            title: string;
+            summary: string;
+            text?: string;
+        };
+        details_url?: string;
+        conclusion?: ConclusionType;
+    }): Promise<{ id: number }> {
+        if (process.env.GITGITGADGET_DRY_RUN) {
+            console.log(`Would create Check Run with options ${JSON.stringify(options, null, 2)}`);
+            return { id: -1 }; // debug mode does not actually do anything
+        }
+
+        await this.ensureAuthenticated(options.owner);
+        const prInfo = await this.getPRInfo(options);
+        const { data } = await this.client.checks.create({
+            ...options,
+            head_sha: prInfo.headCommit,
+            status: options.conclusion ? "completed" : "in_progress",
+        });
+        return data;
+    }
+
+    public async updateCheckRun(options: {
+        owner: string;
+        repo: string;
+        check_run_id: number;
+        output?: {
+            title?: string;
+            summary: string;
+            text?: string;
+        };
+        detailsURL?: string;
+        conclusion?: ConclusionType;
+    }): Promise<{ id: number }> {
+        if (process.env.GITGITGADGET_DRY_RUN) {
+            console.log(`Would create Check Run with options ${JSON.stringify(options, null, 2)}`);
+            return { id: -1 }; // debug mode does not actually do anything
+        }
+
+        await this.ensureAuthenticated(options.owner);
+        const { data } = await this.client.checks.update({
+            ...options,
+            conclusion: options.conclusion,
+            status: options.conclusion ? "completed" : "in_progress",
+        });
+        return data;
+    }
+
     protected async ensureAuthenticated(repositoryOwner: string): Promise<void> {
         if (repositoryOwner !== this.authenticated) {
             let token = this.tokens.get(repositoryOwner);
diff --git a/lib/project-config.ts b/lib/project-config.ts
index c96a732224..3299c60e12 100644
--- a/lib/project-config.ts
+++ b/lib/project-config.ts
@@ -1,5 +1,6 @@
 import * as fs from "fs";
 import path from "path";
+import { ILintCommitConfig } from "./commit-lint.js";
 
 export type projectInfo = {
     to: string; // email to send patches to
@@ -8,49 +9,71 @@ export type projectInfo = {
     urlPrefix: string; // url to 'listserv' of mail (should it be in mailrepo?)
 };
 
+export interface IRepoConfig {
+    name: string; // name of the repo
+    owner: string; // owner of repo holding the notes (tracking data)
+    upstreamOwner: string; // owner of upstream ("base") repo
+    testOwner?: string; // owner of the test repo (if any)
+    branches: string[]; // remote branches to fetch - just use trackingBranches?
+    closingBranches: string[]; // close if the pr is added to this branch
+    trackingBranches: string[]; // comment if the pr is added to this branch
+    maintainerBranch?: string; // branch/owner manually implementing changes
+    host: string;
+}
+
+export interface IMailRepoConfig {
+    name: string;
+    owner: string;
+    branch: string;
+    host: string;
+    url: string;
+    public_inbox_epoch?: number;
+    mirrorURL?: string;
+    mirrorRef?: string;
+    descriptiveName: string;
+}
+export interface IMailConfig {
+    author: string;
+    sender: string;
+    smtpUser: string;
+    smtpHost: string;
+}
+
+export interface IAppConfig {
+    appID: number;
+    installationID: number;
+    name: string;
+    displayName: string; // name to use in comments to identify app
+    installedOn: string[]; // owners of clones being monitored (PR checking)
+    altname: string | undefined; // is this even needed?
+}
+
+export interface ILintConfig {
+    maxCommitsIgnore?: string[]; // array of pull request urls to skip check
+    maxCommits: number; // limit on number of commits in a pull request
+    commitLintOptions?: ILintCommitConfig; // options to pass to commit linter
+}
+
+export interface IUserConfig {
+    allowUserAsLogin: boolean; // use GitHub login as name if name is private
+}
+
+export interface ISyncUpstreamBranchesConfig {
+    sourceRepo: string; // e.g. "gitster/git"
+    targetRepo: string; // e.g. "gitgitgadget/git"
+    sourceRefRegex?: string; // e.g. "^refs/heads/(maint-\\d|[a-z][a-z]/)"
+    targetRefNamespace?: string; // e.g. "git-gui/"
+}
+
 export interface IConfig {
-    repo: {
-        name: string; // name of the repo
-        owner: string; // owner of repo holding the notes (tracking data)
-        baseOwner: string; // owner of upstream ("base") repo
-        testOwner?: string; // owner of the test repo (if any)
-        owners: string[]; // owners of clones being monitored (PR checking)
-        branches: string[]; // remote branches to fetch - just use trackingBranches?
-        closingBranches: string[]; // close if the pr is added to this branch
-        trackingBranches: string[]; // comment if the pr is added to this branch
-        maintainerBranch?: string; // branch/owner manually implementing changes
-        host: string;
-    };
-    mailrepo: {
-        name: string;
-        owner: string;
-        branch: string;
-        host: string;
-        url: string;
-        public_inbox_epoch?: number;
-        mirrorURL?: string;
-        mirrorRef?: string;
-        descriptiveName: string;
-    };
-    mail: {
-        author: string;
-        sender: string;
-    };
+    repo: IRepoConfig;
+    mailrepo: IMailRepoConfig;
+    mail: IMailConfig;
     project?: projectInfo | undefined; // project-options values
-    app: {
-        appID: number;
-        installationID: number;
-        name: string;
-        displayName: string; // name to use in comments to identify app
-        altname: string | undefined; // is this even needed?
-    };
-    lint: {
-        maxCommitsIgnore?: string[]; // array of pull request urls to skip check
-        maxCommits: number; // limit on number of commits in a pull request
-    };
-    user: {
-        allowUserAsLogin: boolean; // use GitHub login as name if name is private
-    };
+    app: IAppConfig;
+    lint: ILintConfig;
+    user: IUserConfig;
+    syncUpstreamBranches: ISyncUpstreamBranchesConfig[]; // branches to sync from upstream to our repo
 }
 
 let config: IConfig; // singleton
@@ -80,8 +103,8 @@ export async function getExternalConfig(file: string): Promise<IConfig> {
         throw new Error(`Invalid 'owner' ${newConfig.repo.owner} in ${filePath}`);
     }
 
-    if (!newConfig.repo.baseOwner.match(/^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}$/i)) {
-        throw new Error(`Invalid 'baseOwner' ${newConfig.repo.baseOwner} in ${filePath}`);
+    if (!newConfig.repo.upstreamOwner.match(/^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}$/i)) {
+        throw new Error(`Invalid 'baseOwner' ${newConfig.repo.upstreamOwner} in ${filePath}`);
     }
 
     return newConfig;
diff --git a/lib/pullRequestKey.ts b/lib/pullRequestKey.ts
index b480cecfc6..a7b8bc3e99 100644
--- a/lib/pullRequestKey.ts
+++ b/lib/pullRequestKey.ts
@@ -15,11 +15,39 @@ export function getPullRequestKey(pullRequest: pullRequestKeyInfo): pullRequestK
     return typeof pullRequest === "string" ? getPullRequestKeyFromURL(pullRequest) : pullRequest;
 }
 
-export function getPullRequestKeyFromURL(pullRequestURL: string): pullRequestKey {
-    const match = pullRequestURL.match(/^https:\/\/github.com\/(.*)\/(.*)\/pull\/(\d+)$/);
+export type pullRequestCommentKey = pullRequestKey & { comment_id: number };
+
+export function getPullRequestOrCommentKeyFromURL(
+    pullRequestOrCommentURL: string,
+): pullRequestKey & { comment_id?: number } {
+    const match = pullRequestOrCommentURL.match(/^https:\/\/github.com\/(.*)\/(.*)\/pull\/(\d+)(.*)$/);
     if (!match) {
-        throw new Error(`Unrecognized PR URL: "${pullRequestURL}`);
+        throw new Error(`Unrecognized PR URL: "${pullRequestOrCommentURL}`);
+    }
+    const match2 = match[4]?.match(/^#issuecomment-(\d+)$/);
+    if (match[4] && !match2) {
+        throw new Error(`Unrecognized PR URL: "${pullRequestOrCommentURL}`);
     }
+    return {
+        owner: match[1],
+        repo: match[2],
+        pull_number: parseInt(match[3], 10),
+        comment_id: match2 ? parseInt(match2[1], 10) : undefined,
+    };
+}
 
-    return { owner: match[1], repo: match[2], pull_number: parseInt(match[3], 10) };
+export function getPullRequestKeyFromURL(pullRequestURL: string): pullRequestKey {
+    const { comment_id, ...prKey } = getPullRequestOrCommentKeyFromURL(pullRequestURL);
+    if (comment_id) {
+        throw new Error(`Expected PR URL, not a PR comment URL: `);
+    }
+    return prKey;
+}
+
+export function getPullRequestCommentKeyFromURL(pullRequestURL: string): pullRequestCommentKey {
+    const result = getPullRequestOrCommentKeyFromURL(pullRequestURL);
+    if (result.comment_id === undefined) {
+        throw new Error(`Expected PR comment URL, not a PR URL: `);
+    }
+    return result as pullRequestCommentKey;
 }
diff --git a/package-lock.json b/package-lock.json
index 8e89fb73f3..9c0acf6d8b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,8 +46,10 @@
         "ts-jest": "^29.4.4",
         "ts-jest-resolver": "^2.0.1",
         "ts-node": "^10.9.2",
-        "typescript": "^5.9.3",
-        "typescript-eslint": "8.46.0"
+        "ts-patch": "^3.3.0",
+        "typescript": "~5.9.3",
+        "typescript-eslint": "8.46.0",
+        "typia": "^9.7.2"
       },
       "engines": {
         "node": ">= 18.16.1"
@@ -1607,6 +1609,28 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@inquirer/external-editor": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@inquirer/external-editor/-/external-editor-1.0.1.tgz",
+      "integrity": "sha512-Oau4yL24d2B5IL4ma4UpbQigkVhzPDXLoqy1ggK4gnHg/stmkffJE4oOXHXF3uz0UEpywG68KcyXsyYpA1Re/Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chardet": "^2.1.0",
+        "iconv-lite": "^0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@types/node": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -3580,6 +3604,13 @@
         "url": "https://opencollective.com/pkgr"
       }
     },
+    "node_modules/@samchon/openapi": {
+      "version": "4.7.1",
+      "resolved": "https://registry.npmjs.org/@samchon/openapi/-/openapi-4.7.1.tgz",
+      "integrity": "sha512-+rkMlSKMt7l3KGWJVWUle1CXEm0vA8FIF2rufHl+T1gN/gGrTEhL1gDK3FHYf8Nl5XReK0r1vL6Q2QTMwQN7xQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@selderee/plugin-htmlparser2": {
       "version": "0.11.0",
       "license": "MIT",
@@ -4253,6 +4284,13 @@
         "node": ">=18.0.0"
       }
     },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.0.0.tgz",
+      "integrity": "sha512-m2bOd0f2RT9k8QJx1JN85cZYyH1RqFBdlwtkSlf4tBDYLCiiZnv1fIIwacK6cqwXavOydf0NPToMQgpKq+dVlA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@stylistic/eslint-plugin": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.4.0.tgz",
@@ -5286,6 +5324,13 @@
       "dev": true,
       "license": "Python-2.0"
     },
+    "node_modules/array-timsort": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-timsort/-/array-timsort-1.0.3.tgz",
+      "integrity": "sha512-/+3GRL7dDAGEfM6TseQk/U+mi18TU2Ms9I3UlLdUMhz2hbvGNTKdj9xniwXfUqgYhHxRx0+8UnKkvlNwVU+cWQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/babel-jest": {
       "version": "30.2.0",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-30.2.0.tgz",
@@ -5400,12 +5445,45 @@
         "node": ">=0.12.0"
       }
     },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/before-after-hook": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/before-after-hook/-/before-after-hook-4.0.0.tgz",
       "integrity": "sha512-q6tR3RPqIB1pMiTRMFcZwuG5T8vwp+vUvEG0vuI6B+Rikh5BfPp2fQ82c925FOs+b0lcFQ8CFrL+KbilfZFhOQ==",
       "license": "Apache-2.0"
     },
+    "node_modules/bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
     "node_modules/bowser": {
       "version": "2.12.0",
       "resolved": "https://registry.npmjs.org/bowser/-/bowser-2.12.0.tgz",
@@ -5488,6 +5566,31 @@
         "node-int64": "^0.4.0"
       }
     },
+    "node_modules/buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "node_modules/buffer-equal-constant-time": {
       "version": "1.0.1",
       "license": "BSD-3-Clause"
@@ -5609,6 +5712,13 @@
         "node": ">=10"
       }
     },
+    "node_modules/chardet": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-2.1.0.tgz",
+      "integrity": "sha512-bNFETTG/pM5ryzQ9Ad0lJOTa6HWD/YsScAR3EnCPZRPlQh77JocYktSHOUHelyhm8IARL+o4c4F1bP5KVOjiRA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/chownr": {
       "version": "2.0.0",
       "license": "ISC",
@@ -5637,6 +5747,42 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "restore-cursor": "^3.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cli-spinners": {
+      "version": "2.9.2",
+      "resolved": "https://registry.npmjs.org/cli-spinners/-/cli-spinners-2.9.2.tgz",
+      "integrity": "sha512-ywqV+5MmyL4E7ybXgKys4DugZbX0FC6LnwrhjuykIjnK9k8OQacQ7axGKnjDXWNhns0xot3bZI5h55H8yo9cJg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/cli-width": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-3.0.0.tgz",
+      "integrity": "sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/cliui": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
@@ -5692,6 +5838,16 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/clone": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.4.tgz",
+      "integrity": "sha512-JQHZ2QMW6l3aH/j6xCqQThY/9OH4D/9ls34cgkUBiEeocRTU04tHfKPBsUK1PqZCUQM7GiA0IIXJSuXHI64Kbg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
     "node_modules/co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
@@ -5735,6 +5891,23 @@
         "node": ">=20"
       }
     },
+    "node_modules/comment-json": {
+      "version": "4.2.5",
+      "resolved": "https://registry.npmjs.org/comment-json/-/comment-json-4.2.5.tgz",
+      "integrity": "sha512-bKw/r35jR3HGt5PEPm1ljsQQGyCrR8sFGNiN5L+ykDHdpO8Smxkrkla9Yi6NkQyUrb8V54PGhfMs6NrIwtxtdw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "array-timsort": "^1.0.3",
+        "core-util-is": "^1.0.3",
+        "esprima": "^4.0.1",
+        "has-own-prop": "^2.0.0",
+        "repeat-string": "^1.6.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/comment-parser": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/comment-parser/-/comment-parser-1.4.1.tgz",
@@ -5755,6 +5928,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/core-util-is": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/create-require": {
       "version": "1.1.1",
       "dev": true,
@@ -5819,6 +5999,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/defaults": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/defaults/-/defaults-1.0.4.tgz",
+      "integrity": "sha512-eFuaLoy/Rxalv2kr+lqMlUnrDWV+3j4pljOIJgLIhI058IQfWJ7vXhyEIHu+HtC738klGALYxOKDO0bQP3tg8A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "clone": "^1.0.2"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/define-data-property": {
       "version": "1.1.4",
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+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/ret/-/ret-0.2.2.tgz",
+      "integrity": "sha512-M0b3YWQs7R3Z917WRQy1HHA7Ba7D8hvZg6UE5mLykJxQVE2ju0IXbGlaHPPlkY+WN7wFP+wUMXmBFA0aV6vYGQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/reusify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -10875,6 +11435,16 @@
         "node": ">=0.8.0"
       }
     },
+    "node_modules/run-async": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.12.0"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -10899,6 +11469,16 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/rxjs": {
+      "version": "7.8.2",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
+      "integrity": "sha512-dhKf903U/PQZY6boNNtAGdWbG85WAbjT/1xYoZIC7FAY0yWapOBQVsVrDl58W86//e1VpMNBtRV4MaXfdMySFA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -11098,6 +11678,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
     "node_modules/string-length": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/string-length/-/string-length-4.0.2.tgz",
@@ -11365,6 +11955,13 @@
         "node": ">= 18.16.1"
       }
     },
+    "node_modules/through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tlds": {
       "version": "1.259.0",
       "resolved": "https://registry.npmjs.org/tlds/-/tlds-1.259.0.tgz",
@@ -11516,6 +12113,25 @@
         }
       }
     },
+    "node_modules/ts-patch": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/ts-patch/-/ts-patch-3.3.0.tgz",
+      "integrity": "sha512-zAOzDnd5qsfEnjd9IGy1IRuvA7ygyyxxdxesbhMdutt8AHFjD8Vw8hU2rMF89HX1BKRWFYqKHrO8Q6lw0NeUZg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chalk": "^4.1.2",
+        "global-prefix": "^4.0.0",
+        "minimist": "^1.2.8",
+        "resolve": "^1.22.2",
+        "semver": "^7.6.3",
+        "strip-ansi": "^6.0.1"
+      },
+      "bin": {
+        "ts-patch": "bin/ts-patch.js",
+        "tspc": "bin/tspc.js"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -11604,6 +12220,38 @@
         "typescript": ">=4.8.4 <6.0.0"
       }
     },
+    "node_modules/typia": {
+      "version": "9.7.2",
+      "resolved": "https://registry.npmjs.org/typia/-/typia-9.7.2.tgz",
+      "integrity": "sha512-eLIKd0KHZtSvbsA+FYwX+Y0ZBt0BwVGz3GgODQX+6GfGL4DOzKW02LEx62oUZg6vCQX1BL5xyiPXAIdW+Hc51g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@samchon/openapi": "^4.7.1",
+        "@standard-schema/spec": "^1.0.0",
+        "commander": "^10.0.0",
+        "comment-json": "^4.2.3",
+        "inquirer": "^8.2.5",
+        "package-manager-detector": "^0.2.0",
+        "randexp": "^0.5.3"
+      },
+      "bin": {
+        "typia": "lib/executable/typia.js"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.8.0 <5.10.0"
+      }
+    },
+    "node_modules/typia/node_modules/commander": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-10.0.1.tgz",
+      "integrity": "sha512-y4Mg2tXshplEbSGzx7amzPwKKOCGuoSRP/CjEdwwk0FOGlUbq6lKuoyDZTNZkmxHdJtp54hdfY/JUrdL7Xfdug==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/uc.micro": {
       "version": "2.0.0",
       "license": "MIT"
@@ -11728,6 +12376,13 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/uuid": {
       "version": "8.3.2",
       "dev": true,
@@ -11764,6 +12419,16 @@
         "makeerror": "1.0.12"
       }
     },
+    "node_modules/wcwidth": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
+      "integrity": "sha512-XHPEwS0q6TaxcvG85+8EYkbiCux2XtWG2mkc47Ng2A77BQu9+DqIOJldST4HgPkuea7dvKSj5VgX3P1d4rW8Tg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "defaults": "^1.0.3"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "dev": true,
diff --git a/package.json b/package.json
index 356109dd36..7325eb6cb0 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,8 @@
     "test:clean": "jest --clearCache && npm test",
     "test:config": "npm run test -- --testRegex=/tests-config/.*\\.test\\.ts",
     "test:watch": "jest --watch --notify --notifyMode=change --coverage",
-    "ci": "npm run lint && npm run test -- --ci --reporters=default --reporters=jest-junit"
+    "ci": "npm run lint && npm run test -- --ci --reporters=default --reporters=jest-junit",
+    "prepare": "ts-patch install"
   },
   "bugs": {
     "url": "https://github.com/gitgitgadget/gitgitgadget/issues"
@@ -70,8 +71,10 @@
     "ts-jest": "^29.4.4",
     "ts-jest-resolver": "^2.0.1",
     "ts-node": "^10.9.2",
-    "typescript": "^5.9.3",
-    "typescript-eslint": "8.46.0"
+    "ts-patch": "^3.3.0",
+    "typescript": "~5.9.3",
+    "typescript-eslint": "8.46.0",
+    "typia": "^9.7.2"
   },
   "dependencies": {
     "@actions/core": "^1.11.1",
diff --git a/script/misc-helper.ts b/script/misc-helper.ts
index 7d16254c5d..00e4319ee6 100644
--- a/script/misc-helper.ts
+++ b/script/misc-helper.ts
@@ -200,7 +200,7 @@ const commandOptions = commander.opts<ICommanderOptions>();
                 originalCommit,
                 gitGitCommit,
                 config.repo.owner,
-                config.repo.baseOwner,
+                config.repo.upstreamOwner,
             );
             console.log(`Created check with id ${id}`);
         });
diff --git a/tests-config/ci-helper.test.ts b/tests-config/ci-helper.test.ts
index 3ce98c5623..752de945a8 100644
--- a/tests-config/ci-helper.test.ts
+++ b/tests-config/ci-helper.test.ts
@@ -16,8 +16,7 @@ const testConfig: IConfig = {
     repo: {
         name: "telescope",
         owner: "webb",
-        baseOwner: "galileo",
-        owners: ["webb", "galileo"],
+        upstreamOwner: "galileo",
         branches: ["maint"],
         closingBranches: ["maint", "main"],
         trackingBranches: ["maint", "main", "hubble"],
@@ -41,7 +40,8 @@ const testConfig: IConfig = {
         installationID: 195971,
         name: "gitgitgadget",
         displayName: "BigScopes",
-        altname: "gitgitgadget-git"
+        altname: "gitgitgadget-git",
+        installedOn: ["webb", "galileo"],
     },
     lint: {
         maxCommitsIgnore: [],
@@ -172,7 +172,7 @@ async function setupRepos(instance: string):
     await gggLocal.git([ "config", `url.${gggRemote.workDir}.insteadOf`, url ]);
     // pretend there are two remotes
     await gggLocal.git([ "config", `url.${gggRemote.workDir}.insteadOf`,
-        `https://github.com/${config.repo.baseOwner}/${config.repo.name}` ]);
+        `https://github.com/${config.repo.upstreamOwner}/${config.repo.name}` ]);
 
     // set needed config
     await worktree.git([ "config", "--add", "gitgitgadget.workDir", gggLocal.workDir, ]);
diff --git a/tests/commit-lint.test.ts b/tests/commit-lint.test.ts
index 37f3b6eb34..da6ec70b20 100644
--- a/tests/commit-lint.test.ts
+++ b/tests/commit-lint.test.ts
@@ -1,5 +1,5 @@
 import { expect, jest, test } from "@jest/globals";
-import { ILintError, ILintOptions, LintCommit } from "../lib/commit-lint.js";
+import { ILintError, ILintCommitConfig, LintCommit } from "../lib/commit-lint.js";
 import { IPRCommit } from "../lib/github-glue.js";
 
 jest.setTimeout(180000);
@@ -15,7 +15,7 @@ jest.setTimeout(180000);
  * @param check a function to verify the lint result
  * @param options extra linter options, if any
  */
-function lintCheck(commit: IPRCommit, check?: (error: ILintError) => void, options?: ILintOptions) {
+function lintCheck(commit: IPRCommit, check?: (error: ILintError) => void, options?: ILintCommitConfig) {
     const linter = new LintCommit(commit, options);
     const lintError = linter.lint();
     if (!check) {
diff --git a/tsconfig.json b/tsconfig.json
index 71cbfe8ffd..97bc0e57fc 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -42,7 +42,7 @@
     "types": [ "node" ],                      /* Type declaration files to be included in compilation. */
     // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
     "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    "forceConsistentCasingInFileNames": true
+    "forceConsistentCasingInFileNames": true,
     // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
 
     /* Source Map Options */
@@ -54,6 +54,13 @@
     /* Experimental Options */
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+    "plugins": [
+      {
+        "transform": "typia/lib/transform"
+      }
+    ],
+    "skipLibCheck": true,
+    "strictNullChecks": true
   },
   "include": [
     "lib/**/*.ts",
diff --git a/update-mail-to-commit-notes/action.yml b/update-mail-to-commit-notes/action.yml
index 76e2b3b1a4..30166453c0 100644
--- a/update-mail-to-commit-notes/action.yml
+++ b/update-mail-to-commit-notes/action.yml
@@ -2,6 +2,9 @@ name: 'Update the mail <-> commit notes'
 description: 'Updates the mapping between commits and patch emails, stored in the `mail-to-commit` and `commit-to-mail` Git notes refs.'
 author: 'Johannes Schindelin'
 inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
   pr-repo-token:
     description: 'The access token to work on the repository that holds PRs and state'
     required: true
diff --git a/update-prs/action.yml b/update-prs/action.yml
index 34dbaecf0b..f5cfd056a6 100644
--- a/update-prs/action.yml
+++ b/update-prs/action.yml
@@ -2,6 +2,9 @@ name: 'Update the Pull Requests'
 description: 'Updates the Pull Requests in response to upstream commits'
 author: 'Johannes Schindelin'
 inputs:
+  config:
+    description: 'The GitGitGadget configuration to use (see https://github.com/gitgitgadget/gitgitgadget/blob/HEAD/lib/project-config.ts)'
+    default: '' # sadly, ${{ vars.CONFIG }} does not work, and documentation about what contexts are permissible here is sorely missing
   pr-repo-token:
     description: 'The access token to work on the repository that holds PRs and state'
     required: true