Phase 997: document partition heal actions embed extract (v0.8.964)

Roadmap Phase 997 complete (47/50). Updated MESH_STABILITY, testing,
module index, and release notes for partition heal actions UI parity
extract. Non-breaking refactor documentation only.

Co-authored-by: Cursor <[email protected]>

release_notes/RELEASE_v0.8.964.md

@@ -0,0 +1,35 @@
+# Release v0.8.964 — Phase 997: Mesh Stability UI Partition Heal Actions Embed Keys Extract
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI parity hardening
+
+## Summary
+
+Phase 997 extracts the partition heal run and export diagnostics buttons
+from `app.js` into dedicated platform keys and UI modules — strings and markup
+unchanged. Complements Phase 991 partition heal diagnostics section extract.
+
+## New Modules
+
+### `pearcord-platform/mesh-stability-ui-partition-heal-actions-keys.js`
+
+- 2 field keys (`hasGuildSyncHealth`, `partitionHealInProgress`) + 2 embed parts
+- Button id constants (`btn-run-partition-heal-sync`, `btn-export-partition-heal-diagnostics`)
+- `buildMeshStabilityPartitionHealActionsSnapshot()`
+
+### `apps/pearcord/ui/mesh-stability-ui-partition-heal-actions.js`
+
+- `buildMeshStabilityPartitionHealActionsEmbedHtml()` — run heal + export button embed
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-partition-heal-actions-build.cjs` — keys + UI embed
+- `smoke-phase997-boot-gate.cjs` — version check (0.8.964)
+- `smoke-agentctl-mesh-stability-ui-partition-heal-actions-journey-stub.cjs` — agentctl stub
+- `test:mesh-stability-stats` — extended with partition heal actions snapshot assertions
+- `test:gossip-rpc-pull-unit` — extended with partition heal actions embed part keys
+- `test:ci-phase997` — full CI bundle
+
+## Version
+
+`0.8.963` → `0.8.964`