Rename RFCs to Agent Notes

.agents/notes/proposed/process/2026-06-11-api-extractor-reports.md

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+# Agent Note: API extractor reports
+
+Status: proposed
+
+> Split out from the original "Doc-sync and API reports" Agent Note (2026-06-11). Parts 1-2 (doc-block typechecking, event-taxonomy verification) shipped — see [doc-sync enforcement](../../implemented/process/2026-06-11-doc-sync-enforcement.md). This is the deferred part 3, kept as a standalone proposal.
+
+## Problem
+
+Public API changes are invisible — nothing makes "this commit changed the public surface" an explicit, reviewable fact. A reviewer reading a diff can miss that an exported type gained a field or a method signature shifted.
+
+## Proposal
+
+api-extractor (or `tsc --emitDeclarationOnly` + a normalized public-surface dump) producing a checked-in `etc/<pkg>.api.md` per package; CI fails if regeneration differs. Every public-API change becomes a diff line a reviewer (or review agent) must see.
+
+## Alternatives considered
+
+**`tsc --emitDeclarationOnly` plus a normalized public-surface dump** — the lighter mechanism if api-extractor proves too heavy; either satisfies the checked-in, diffable report shape the proposal needs.
+
+## Acceptance criteria
+
+- Every package has a checked-in `etc/<pkg>.api.md`; CI fails when regeneration differs from the committed report.
+- A public-API change (a new export, a widened field, a shifted signature) is visible as a report diff line in review.
+
+## Risks
+
+The dependency is heavy and finicky — the reason this was deferred — and the report format churns with compiler upgrades, adding a maintenance surface that buys little while the packages stay unpublished.
+
+## Why deferred
+
+Deferred when doc-sync landed: low value for an internal monorepo where reviewers already see the source diff, and a heavy, finicky dependency. Revisit if the packages are ever published externally — at that point a stable, diffable public surface earns its keep.