chore(repo): initialize workspace

AGENTS.md

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+# Repository instructions
+
+## Commit convention
+
+Use Conventional Commits for all commit messages.
+Before writing a commit message, please read [[docs/conventional-commits]].
+Do not add agent attribution or co-author trailers.
+
+## Gotchas
+
+- When materializing an external specification, standard, or project-maintained convention, use the upstream source instead of reconstructing it from memory.
+  Preserve local policy separately from copied upstream text.