Phase 1017: document guild churn rejoin refresh extract (v0.8.984).

Update PLATFORM_ROADMAP, MESH_STABILITY, AUTOMATED_TESTING, MODULES,
DOCUMENTATION_INDEX, and release notes for mesh stability UI chrome refresh
track Phase 1017. Non-breaking refactor documentation only.

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

release_notes/RELEASE_v0.8.984.md

@@ -0,0 +1,34 @@
+# Release v0.8.984 — Phase 1017: Mesh Stability UI Guild Churn Rejoin Light-Poll Refresh
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI chrome refresh track
+
+## Summary
+
+Phase 1017 extracts `guildChurnRejoinNeedsRefresh` from the consolidated
+refresh-predicates module into dedicated platform + UI modules. Churn rejoin
+chrome refresh during light state polls is unchanged; rail hash import
+(`hashGuildChurnRejoinForView`) preserved in `mesh-stability-ui-rail-hash.js`.
+Refresh-predicates re-exports for Phase 983 backward compatibility.
+
+## New Modules
+
+### `pearcord-platform/mesh-stability-ui-guild-churn-rejoin-refresh-keys.js`
+
+- 6 field keys + `evalGuildChurnRejoinNeedsRefresh()` + snapshot builder
+
+### `apps/pearcord/ui/mesh-stability-ui-guild-churn-rejoin-refresh.js`
+
+- `guildChurnRejoinNeedsRefresh()` wired via `hashGuildChurnRejoinForView` from rail-hash
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-guild-churn-rejoin-refresh-build.cjs` — keys + eval + app.js wire
+- `smoke-phase1017-boot-gate.cjs` — version check (0.8.984)
+- `smoke-agentctl-mesh-stability-ui-guild-churn-rejoin-refresh-journey-stub.cjs` — agentctl stub
+- `test:mesh-stability-stats` / `test:gossip-rpc-pull-unit` — extended with churn rejoin keys
+- `test:ci-phase1017` — full meta-bundle
+
+## Version
+
+`0.8.983` → `0.8.984`