jif 960e878df4 Preserve queued agent mail across session eviction (#50087) ...

## 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

2026-10-01 20:17:34 +00:00

..

common

Add an opt-in model catalog to multi-agent context (#49560)

2026-09-30 10:03:09 +00:00

remote_env_windows

Apply remote platform semantics to exec safety checks (#42113)

2026-09-01 18:24:56 +00:00

suite

Preserve queued agent mail across session eviction (#50087)

2026-10-01 20:17:34 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

mcp_trace_propagation.rs

Preserve MCP request trace context across transport workers (#47212)

2026-09-22 06:47:07 +00:00

responses_headers.rs

Preserve tool metadata for OpenAI provider endpoint overrides (#48344)

2026-09-26 03:49:14 +00:00