Topics describe Echo's current architectural boundaries. They are neither historical design packets nor work trackers. Update a topic in the same change that changes its boundary, and anchor strong claims to code, tests, specs, or an ADR.

• Causal anchors
• Contract inverse admission
• Generated rule authorship
• Obstructions
• Runtime authority
• Runtime constellation
• Security posture and threat models
• Strands and braids
• WAL truth boundary
• WARP optics