docs: migrate project memory governance

.project-docs/90-maintenance/stale-items.md

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+# Stale Items
+
+This is the integrated registry of stale or conflicting canonical memory. Update it only in Integration Gate.
+
+## Possibly Stale Or Conflicting
+
+| Date | Document | Issue | Source Task | Needed Confirmation |
+|---|---|---|---|---|
+| 2026-08-28 | Archived legacy progress and plan snapshots | Process IDs, live/ready state, AgentBus channel readiness, and browser handshake are observations from one time window, not durable current state. | `20260828-migrate-project-docs-6f1a9c2d` | Re-run live read-only checks before relying on runtime state. |
+
+## Missing Context
+
+- Fresh authorized ERP read evidence for the shared-mother-plan `tid-only` visitor export branch.
+- Current-version authorized ERP write evidence for independent SGL/TWN and four headcount mappings.
+
+## Feature Task Routing
+
+A feature task records new uncertainty in its own task record. When a separate conflict record is needed, write `90-maintenance/conflicts/{task_id}__<slug>.md`; do not append concurrent feature work here.