Lane COM: Front Desk and cross-department coordination

[caosos]

Parent: #25

Ownership

Communications / Front Desk coordination only.

Build

• unresolved coordination queue
• transportation coordination visibility
• department handoffs and acknowledgements
• resident/staff message routing where supported
• Grand Central event consumption/receipts

Required tests

• one handoff retry does not create duplicate work
• acknowledgement is idempotent
• linked item preserves resident/room identity
• completing source work clears/updates Front Desk state correctly
• unrelated department work remains separate

Acceptance

During the live simulated building day, Front Desk visibly receives and clears real coordination work produced by other agents.