docs(phase978): guild mesh track regression chain + v0.8.945

Document Phase 978 regression chain smoke, update roadmap to complete
978 and queue 979, and add release notes for v0.8.945.

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

release_notes/RELEASE_v0.8.945.md

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+# Release v0.8.945 — Phase 978: Guild Mesh Production Track Regression Chain 956–977
+
+**Date:** 2026-06-05
+**Type:** Non-breaking refactor — Guild mesh production hardening
+
+## Summary
+
+Phase 978 closes the guild mesh production hardening track regression chain (phases 956–977)
+with a CI script registry smoke mirroring the export mesh track closure pattern from Phase 955.
+
+## New Module
+
+### `pearcord-platform/guild-mesh-production-track-regression-chain`
+
+- `listGuildMeshTrackRegressionPhases()` — phases 956–977 (22 entries)
+- `resolveGuildMeshTrackRegressionCiScript(phase)` — `test:ci-phase{N}`
+- `resolveGuildMeshTrackRegressionBootGateScript(phase)` — `test:phase{N}-boot-gate`
+- `buildGuildMeshTrackRegressionChainSnapshot()` — chain metadata envelope
+
+## Test Coverage
+
+- `smoke-guild-mesh-track-regression-chain.cjs` — verifies CI scripts + boot gate files for phases 956–977
+- `smoke-phase978-boot-gate.cjs` — structural verification + version check (0.8.945)
+- `smoke-agentctl-guild-mesh-track-regression-chain-journey-stub.cjs` — agentctl integration stub
+- `test:mesh-stability-stats` — extended with regression chain snapshot assertions
+- `test:gossip-rpc-pull-unit` — extended with regression chain registry assertions
+- `test:ci-phase978` — full CI bundle
+
+## Version
+
+`0.8.944` → `0.8.945`