Ruslan Nigmatullin 66d0de9983 Add lifecycle hooks for inter-agent messages (#55657) ...

## What changed

Add `MessageLifecycleContributor` hooks to capture extension state when local agent control publishes a message and notify contributors when the recipient commits it to history, before sampling.

Carry shared delivery state through submissions, input queues, and mailbox eviction with `PendingAgentMessage`. Notify consumption at most once per delivery, release captured state when consumed or abandoned, and drop pending mail outside queue locks. Preserve the serialized message format without republishing restored history.

## Testing

Extend the mailbox eviction test to verify that publication state survives eviction and retained messages are consumed before the first resumed model sample.

GitOrigin-RevId: 9a1f6832bd48ec646a3fd179485c095e8dcc72cc

2026-10-20 19:39:43 +00:00

..

examples

Require content kinds for extension prompt fragments (#40177)

2026-08-23 03:12:58 +00:00

src

Add lifecycle hooks for inter-agent messages (#55657)

2026-10-20 19:39:43 +00:00

tests

Acquire and cache opt-in executor capability inventories via V2 (#53736)

2026-10-13 18:15:50 +00:00

BUILD.bazel

extension: add initial typed extension API (#21736)

2026-05-11 11:06:24 +02:00

Cargo.toml

Reconcile V2 executor plugins with cloud catalogs (#55301)

2026-10-19 15:15:17 +00:00

notes.md

Normalize formatting in docs, web assets, and sample scripts (#52256)

2026-10-08 20:11:43 +00:00