finish(STATE-WP-0064): cut over scheduler and split sweep errors from failures

STATE-WP-0064 cutover (state-hub only):
- Retire local custodian-sync.timer; archive units under infra/systemd/archived/
- Mark workplan finished; update infra/README, cron-migration, runbook, AGENTS.md
- Point activity-core-delegation at the consistency-sweep runbook

Consistency engine — automation error vs assessment failure:
- C-00 is an automation error; C-01..C-23 assessment failures are recorded
  for follow-up but no longer fail --remote --all scheduled sweeps (exit 0)
- Skip workplans/README.md in the workplan glob (human index, not a workplan)
- Progress events and compare script expose automation_error and
  assessment_failures separately from exit_code

docs/activity-core-delegation.md

@@ -84,7 +84,9 @@ unset.
   the rule lives in activity-core.
 
 See [`docs/cron-migration.md`](cron-migration.md) for the
-ActivityDefinition drafts and cutover plan.
+ActivityDefinition drafts and cutover plan. The consistency sweep schedule
+is live on Railiance01 — operator runbook:
+[`docs/consistency-sweep-runbook.md`](consistency-sweep-runbook.md).
 
 ## What must never happen