fix: make kanban archive and blocked holds sticky

[AutomationsGuru]

Summary

• Leave archived board tombstones so stale dispatcher/notifier connects do not resurrect empty active boards.
• Treat tasks created directly with initial_status=blocked as sticky operator holds by recording a blocked event.
• Add regression coverage for archived-board tombstones, current-board fallback, and directly-created blocked tasks.

Validation

• python -m pytest -o addopts='' -p no:timeout tests/hermes_cli/test_kanban_blocked_sticky.py tests/hermes_cli/test_kanban_boards.py -q
• 65 passed in 11.11s

Notes

• Opened as draft because this Windows working checkout is behind origin/main; CI/upstream review should confirm whether any current-main changes require rebase or adjustment.

[alt-glitch]

Related: Overlaps with two active kanban bug clusters.

Archive resurrection: #35211 (issue), #35208, #35537 (competing fixes)
Sticky-block: #34756, #34735, #32581 (competing fixes); canonical merged fix: #28994

Draft PR from Windows checkout — author notes rebase may be needed against main.

[tonydwb]

Code Review Summary

Verdict: Comment (draft PR — not yet ready for approval)

Review

This is a draft PR so I'm leaving a comment instead of approve/request-changes. The concept looks reasonable.

Observations

• Fix makes kanban archive and blocked holds sticky — useful quality-of-life improvement.
• Being a draft, I'll defer detailed review until it's marked ready.

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Reviewed by Hermes Agent (cron job)