[W9-log] sprint-log: agent W9 commit log + self-review

Author: AdaWorldAPI

.claude/board/sprint-log/agents/agent-W9.md

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+# Agent W9 — medcare-realtime/src/gate.rs (MedCareMembraneGate)
+
+**Round:** 3 (Stage 3 — MedCareMembraneGate impl)
+**Owner:** crates/medcare-realtime/src/gate.rs (~360 LOC, 13 tests)
+**Commit:** medcare-rs `702e863`
+**Status:** ✅ committed
+
+## Action
+
+Mirror of smb-office-rs#29 SmbMembraneGate adapted to medcare. Newtype
+wrapping `Arc<medcare_rbac::Policy>` + (role × entity) binding to bridge
+the orphan rule with upstream `MembraneGate` trait.
+
+## Output verification
+
+- ✅ Builders: new, with_write_predicate, with_read_depth, from_medcare_policy
+- ✅ `evaluate(commit) -> AccessDecision` exposes Escalate distinctly
+- ✅ `impl MembraneGate for MedCareMembraneGate` collapses to bool
+- ✅ Three TD caveats from PR #29 documented in module head
+- ✅ I-2 invariant: Send + Sync without async runtime (compile-time test)
+
+## 13 tests
+
+Doctor happy path (2) + Unknown role (2) + Auditor split (1) +
+Receptionist depth gating (2 — CRITICAL #2 carry-forward) +
+Anamnese append-only (3 — CRITICAL #1 carry-forward) +
+Pinned predicate (1) + Arc share + AllowAllGate (2) +
+Send+Sync compile (1).
+
+## Self-review
+
+- ✅ Mirrors PR #29 file-for-file with medcare type substitution
+- ⚠️ BtM Escalate path not implemented in v1 (gate doesn't see row data)
+- ⚠️ Action operations not reachable via gate — flagged for Meta-3 review