Phase 1021: document quad presence/roster bundle refresh extract (v0.8.988).

Roadmap, testing, modules, and release notes updated for three quad
presence/roster predicate modules and test:ci-phase1021 bundle.

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

release_notes/RELEASE_v0.8.988.md

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+# Release v0.8.988 — Phase 1021: Mesh Stability UI Quad Presence/Roster Bundle Refresh
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI chrome refresh track
+
+## Summary
+
+Phase 1021 extracts three quad composite light-poll refresh predicates from `app.js`
+into dedicated platform + UI modules: `guildQuadPresenceNeedsRefresh`,
+`guildQuadRosterCompleteNeedsRefresh`, and `guildQuadRosterNeedsRefresh`.
+Composite hash builders extend `mesh-stability-ui-guild-quad-composite-hash.js`.
+Chrome handlers (`syncGuildQuadPresenceChrome`, `syncGuildQuadRosterCompleteChrome`,
+`syncGuildQuadRosterChrome`) unchanged.
+
+## New Modules
+
+### Extended `apps/pearcord/ui/mesh-stability-ui-guild-quad-composite-hash.js`
+
+- `hashGuildQuadPresenceForView`, `hashGuildQuadRosterCompleteForView`, `hashGuildQuadRosterForView`
+
+### Platform keys (3 predicates + bundle kind registry)
+
+- `mesh-stability-ui-guild-quad-presence-refresh-keys.js`
+- `mesh-stability-ui-guild-quad-roster-complete-refresh-keys.js`
+- `mesh-stability-ui-guild-quad-roster-refresh-keys.js`
+- `mesh-stability-ui-guild-quad-presence-roster-bundle-refresh-keys.js`
+
+### UI predicates
+
+- `mesh-stability-ui-guild-quad-presence-refresh.js`
+- `mesh-stability-ui-guild-quad-roster-complete-refresh.js`
+- `mesh-stability-ui-guild-quad-roster-refresh.js`
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-guild-quad-presence-roster-bundle-refresh-build.cjs`
+- `smoke-phase1021-boot-gate.cjs`
+- `smoke-agentctl-mesh-stability-ui-guild-quad-presence-roster-bundle-refresh-journey-stub.cjs`
+- `test:ci-phase1021` — full meta-bundle
+
+## Version
+
+`0.8.987` → `0.8.988`