docs(phase987): mesh stability UI bandwidth diagnostics v0.8.954

Mark Phase 987 complete (47/50), update roadmap to Phase 988, and document
bandwidth diagnostics modules, CI bundle, and release notes.

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

release_notes/RELEASE_v0.8.954.md

@@ -0,0 +1,35 @@
+# Release v0.8.954 — Phase 987: Mesh Stability UI Bandwidth Diagnostics Embed Keys Extract
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — mesh stability UI parity hardening
+
+## Summary
+
+Phase 987 extracts diagnostics panel bandwidth sparkline, progress bar, and hint
+embed from `app.js` into dedicated modules with identical HTML and copy.
+
+## New Modules
+
+### `pearcord-platform/mesh-stability-ui-bandwidth-diagnostics-keys.js`
+
+- 4 field keys: bandwidthUsedBytes, bandwidthCapEffective, bandwidthDeferred, usagePct
+- 3 embed part keys: sparkline, progressBar, hintLine
+- `buildMeshStabilityBandwidthDiagnosticsSnapshot()`
+
+### `apps/pearcord/ui/mesh-stability-ui-bandwidth-diagnostics.js`
+
+- `pushBandwidthSparklineSample()`, `bandwidthSparklineSvg()`
+- `formatMeshStabilityBandwidthHintLine()`, `buildMeshStabilityBandwidthDiagnosticsEmbedHtml()`
+
+## Test Coverage
+
+- `smoke-mesh-stability-ui-bandwidth-diagnostics-build.cjs` — keys registry + embed HTML + app.js wire checks
+- `smoke-phase987-boot-gate.cjs` — version check (0.8.954)
+- `smoke-agentctl-mesh-stability-ui-bandwidth-diagnostics-journey-stub.cjs` — agentctl integration stub
+- `smoke-guild-sync-bw-sparkline-ui.cjs` — extended to import bandwidth diagnostics module
+- `test:mesh-stability-stats` — extended with bandwidth diagnostics snapshot assertions
+- `test:ci-phase987` — full CI bundle
+
+## Version
+
+`0.8.953` → `0.8.954`