Summary

• capture initialized LSP workspace folders and discover configured projects while excluding dependency/build/tool directories
• follow in-workspace project references, including explicitly named config files, and preserve each project's resolver/checker options
• union semantic references across project models through canonical declaration path, offset, and namespace identity
• keep valid results while marking malformed configs, failed roots, and out-of-workspace references incomplete
• cover differing path aliases, custom referenced configs, catalog refresh, workspace boundaries, and handler wiring

Verification

• dotnet test SharpTS.Tests/SharpTS.Tests.csproj --filter FullyQualifiedName~LanguageServer --no-restore (97 passed)
• dotnet test SharpTS.Tests/SharpTS.Tests.csproj --no-restore (16,246 passed)
• dotnet build SharpTS.LanguageServer/SharpTS.LanguageServer.csproj --no-restore
• git diff --check

Refs #1306