Add buildroom Control Room cron loop

[Danservfinn]

Summary

• Merge Control Room frontend lineage by building on current main
• Add cron-ready Control Room regeneration and attention extraction script
• Emit attention-items and Kanban task draft JSON for watch/investigate/missing-evidence/operator-decision/retention follow-ups
• Add focused tests for attention payloads, Kanban drafts, and fail-on-actionable behavior

Verification

• demo room validation passed
• gkisokay room validation passed
• pytest: 21 passed
• compileall passed
• scoped leakage scan: 0 findings

Receipt

• Brain receipt: /Users/kublai/brain/receipts/kurultai/2026-05-11-buildroom-control-room-cron-v0.md