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Preserve queued agent mail across session eviction - #50087
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## Why Unread queue-only messages prevented idle agents from unloading, and sending a message to an evicted agent reloaded its session. Pending mail should not require an idle recipient to occupy a loaded thread slot. ## What changed - Retain queue-only mail in an in-memory runtime mailbox when a session unloads. Queue new messages for locally evicted agents without reloading them or starting a turn. - Add `AgentControl::take_mailbox` and `AgentControl::watch_mailbox` so sessions can consume retained mail and react to host mailbox notifications. - Preserve message order across eviction, reload, and subsequent follow-ups. Keep agents with outstanding durable sleep or turn-triggering mail loaded, and discard retained mail when an agent is removed or its tree shuts down. ## Testing Add integration coverage for retaining mail across eviction, sending while unloaded, and ordering messages around a follow-up after reload. Add a host controller test verifying that mailbox notifications wake `wait_agent` and that the message is delivered exactly once. GitOrigin-RevId: 4b55647f9ee9d1aaf3753f0688863bda81617327
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Preserve queued agent mail across session eviction
Why
Unread queue-only messages prevented idle agents from unloading, and sending a
message to an evicted agent reloaded its session. Pending mail should not require
an idle recipient to occupy a loaded thread slot.
What changed
Queue new messages for locally evicted agents without reloading them or
starting a turn.
AgentControl::take_mailboxandAgentControl::watch_mailboxso sessionscan consume retained mail and react to host mailbox notifications.
Keep agents with outstanding durable sleep or turn-triggering mail loaded,
and discard retained mail when an agent is removed or its tree shuts down.
Testing
Add integration coverage for retaining mail across eviction, sending while
unloaded, and ordering messages around a follow-up after reload. Add a host
controller test verifying that mailbox notifications wake
wait_agentandthat the message is delivered exactly once.