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M0/M1/M2/M3 done + live-verified; M4 R4.1/R4.3(idle)/R4.4 merged to main; the grpc-tooling-completion plan is fully executed. Add a top-of-file status banner enumerating the only remaining items and why each is gated (infra-gated event-row retrieval + active-SF magnitude; capture-gated SendEvent; server-walled SQL + revision edits; out-of-scope ReadBlocks / DeleteTagExtendedProperties). Nothing left is a pure code task. README transport matrix stays authoritative per-op. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC