docs(phase985): mesh stability UI sync chrome chain v0.8.952

Mark Phase 985 complete (47/50), update roadmap to Phase 986, and document
sync chrome chain modules, CI bundle, and release notes.

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

release_notes/RELEASE_v0.8.952.md

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+# Release v0.8.952 — Phase 985: Mesh Stability UI Sync Chrome Chain Keys Extract
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI parity hardening
+
+## Summary
+
+Phase 985 extracts mesh stability UI sync chrome chain step registries and handler
+name keys from implicit `app.js` orchestration into dedicated modules. Six sync
+handlers adopt a shared guild-mode guard with identical call order.
+
+## New Modules
+
+### `pearcord-platform/mesh-stability-ui-sync-chrome-chain-keys.js`
+
+- 7 chain kind keys aligned with Phase 981 rail hash kinds
+- Per-chain step lists and handler name map
+- `buildMeshStabilitySyncChromeChainSnapshot()`
+
+### `apps/pearcord/ui/mesh-stability-ui-sync-chrome-chain.js`
+
+- Re-exports platform chain registry
+- `isMeshStabilityGuildSyncMode()` shared guard
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-sync-chrome-chain-build.cjs` — chain registry + guard + app.js wire checks
+- `smoke-phase985-boot-gate.cjs` — version check (0.8.952)
+- `smoke-agentctl-mesh-stability-ui-sync-chrome-chain-journey-stub.cjs` — agentctl integration stub
+- `test:mesh-stability-stats` — extended with sync chrome chain snapshot assertions
+- `test:gossip-rpc-pull-unit` — extended with sync chrome chain key assertions
+- `test:ci-phase985` — full CI bundle
+
+## Version
+
+`0.8.951` → `0.8.952`