Lane MNT: Maintenance Calls agent and work queue

[caosos]

Parent: #25

Ownership

Maintenance Calls only.

Build

• resident maintenance call intake
• acknowledge -> start -> blocked/parts/vendor -> complete lifecycle
• resident-visible status
• Grand Central maintenance.call.* events
• bridge into existing maintenance/work-order concepts without duplicate records

Required tests

• same open issue re-request increments attention instead of duplicating
• two different maintenance issues in same room remain distinct
• category-only dedupe is prohibited
• event replay is idempotent
• resident/room isolation
• completion/status is reflected consistently to staff, room profile, and Aria

Acceptance

Maintenance Calls operate as their own live queue in the simulated building and preserve issue identity correctly.