epic(meta): architecture and agent policy remediation

[LMLiam]

Outcome

Repository agent policy, module facts, API references, and durable architecture decisions remain concise and coherent under #403.

Implementation order

Run these delivery issues in this order. #420 also requires the API baseline from #55.

1. refactor(agent): make repository agent policy concise, neutral, and safe #375 — make repository agent policy concise, neutral, and safe
2. refactor(meta): centralise module facts and enforce architecture boundaries #378 — centralise module facts and enforce architecture boundaries
3. chore(agent): generate a concise Kotventure API index #420 — generate a concise Kotventure API index
4. docs(architecture): record durable decisions and pull-request validation evidence #423 — record durable decisions and pull-request validation evidence

Maintainer instructions and AGENTS.md own requirements. Gradle owns derivable module facts. Architecture decision records own accepted decisions. Generated references remain derived.

Completion

Close this epic when every retained native child is complete or explicitly not planned.