feat: add git-consistent memory gateway architecture

testdata/meetings/2026-03-01-architecture.md

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+# Architecture Sync 2026-03-01
+
+Decisions:
+
+- Use QMD as internal shared MCP endpoint.
+- Keep HTTP endpoint on port 8181.
+- Persist cache and index to avoid repeated cold starts.
+- Confirm disaster recovery RTO target remains 2 hours.

testdata/meetings/2026-03-02-ops.md

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+# Ops Review 2026-03-02
+
+Action items:
+
+- Add smoke test covering health, collection add, embed, search, and query.
+- Validate that deep query can locate runbook and recovery policy.