docs: migrate project memory governance

.project-docs/30-worklog/task-history.md

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+# Task History
+
+This is integrated history. Feature tasks write only their task-scoped records; Integration Gate updates this file when a concise milestone remains useful.
+
+| Date | Milestone | Result | Detail |
+|---|---|---|---|
+| 2026-08-28 | Project documentation migration | `.project-docs/` became the sole active project-memory system; legacy root planning files were preserved in date-scoped history. | [Integration task](tasks/20260828-migrate-project-docs-6f1a9c2d.md) |
+| 2026-08-28 | AgentBus reconnect | Authorized control-plane restart completed; database, migration 014, and 4/4 channels were repeatedly ready. | [Archived legacy progress](../../archive/project-history/2026-08-28/legacy-planning-with-files-progress-final.md) |
+| 2026-08-28 | Shared mother-plan whole-visitor export | Released strict `shared_plan + visitor-list + tid-only` routing and execution boundaries in extension `0.5.157`. | [Release gate](../../agent设计规范/test-fixtures/lwlt-lifecycle/release-gate.md) |