docs: truth sweep — retire stale registers, reconcile ledgers with shipped state

- deferred.md: DELETED (git rm) — stale 2026-07-10 duplicate of the canonical
  deferred-work register; this completes archreview R2-08 T11 (the file was
  tracked, not untracked as the task assumed)
- ScadaBridge-docs-issues.md, ScadaBridge-docs-fixed.md: DELETED (git rm) —
  generated 2026-07-10 CommentChecker reports, already consumed; completes
  R2-08 T13 (also tracked, not untracked)
- stillpending.md: prepended historical-snapshot banner (2026-06-15 audit;
  Tier-1 table is not current open work)
- docs/plans/phase-8-checklist.md: replaced the unevidenced 'Complete / All
  passing' stub with the honest state per register row 25 (WP-4 target-scale
  load test never run)
- archreview/plans/00-MASTER-TRACKER.md: R2-01 T2 live failover drill
  annotated RESOLVED 2026-08-01 (PLAN-R2-01 T4 + docker/failover-drill.sh +
  SbrFailoverTests); R2-08 T11/T13 recorded completed by this sweep
- docs/plans/2026-07-22-clusterclient-to-grpc-plan.md: P3 deferred-RPCs note
  updated (all four live-proven 2026-08-01, 1c99d6fa); ClusterClientSiteAuditClient
  naming follow-up marked DONE (63c16d69)
- docs/plans/2026-05-28-opcua-tag-browser.md.tasks.json: Task 19 flipped to
  completed (manual smoke PASS 2026-08-01, 6dc5d94c)
- archreview/plans/PLAN-R2-0[1-8]*.tasks.json: all-pending manifests reconciled
  with the authoritative tracker (round 2 merged @ 1930f19b) — flipped to
  completed except R2-08 T1/T2 which remain pending needs-user
- docs/operations/2026-07-16-secrets-clustered-master-key.md: correction banner
  (SQL-hub replication shipped 8e12f994; KEK-rotation + clustered-secrets
  runbooks ship with ZB.MOM.WW.Secrets)
- docs/plans/2026-07-19-localdb-phase2-live-gate.md: external-system-delete
  observation annotated RESOLVED (2d03f2d5 reconciles deletions incl.
  external_systems)

Claude-Session: https://claude.ai/code/session_014WNM4vjoVksyyBraTXSZE1

docs/plans/2026-07-19-localdb-phase2-live-gate.md

@@ -192,6 +192,14 @@ was down and back to 0 after rejoin.
   `GateDeadTarget` centrally and re-running `deploy artifacts`, both site nodes still carry it.
   Artifact application is an upsert with no reconciliation of removals. Pre-existing behaviour in
   the artifact pipeline, unrelated to LocalDb — but it means site config tables accumulate orphans.
+  **Update 2026-08-07 (truth sweep): RESOLVED** by `2d03f2d5` ("fix(site-runtime): reconcile
+  artifact deletions on apply", 2026-08-01) — the artifact apply is now upsert-then-reconcile:
+  after storing the incoming complete set, `SiteStorageService.DeleteRowsExceptAsync` removes any
+  stored row absent from it, per artifact table, explicitly including **external systems**
+  (`DeleteExternalSystemsExceptAsync` on `external_systems`) plus shared scripts, database
+  connections and data-connection definitions; a null (not-shipped) list still touches nothing,
+  and runtime cleanup rides along (shared-script unregistration, DCL eviction of the removed
+  connection).
 - **Deleting an instance orphans its buffered messages.** Removing the `soakgen-*` instances left
   their 11,804 `sf_messages` with no tracking snapshot, producing a continuous
   `Cached-telemetry drain: no tracking snapshot for …` warning flood. Also pre-existing, and worth