docs: remove stale plans and require OIDC release Actions

AGENTS.md

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+# Agent instructions
+
+Publish exclusively through `.github/workflows/release.yml` with GitHub OIDC.
+Its package release script is a workflow entrypoint: never publish locally,
+request npm publishing tokens/login, or troubleshoot local publishing auth.
+Use the existing Changesets flow and verify Actions plus the registry before
+updating installations.
+
+Delete dead code, obsolete scripts, duplicate workarounds, and unused legacy
+installs. Check active owners/references first; preserve auth, operator env,
+durable data, and intentional duplicate suppression. Prefer existing helpers,
+stdlib, and native features over new wrappers or fallback frameworks.