jif 612e6491d5 Prewarm shell snapshots for eligible turns (#42137) ...

## Why

Shell Snapshot V2 previously captured the login-shell environment lazily when a
command started, adding that work to the command path.

## What changed

- Start one asynchronous snapshot capture after turn hooks accept the turn, so
  eligible local `exec_command` calls can reuse it without blocking the model.
- Use the turn's resolved tools, permissions, sandbox, environment, and shell
  configuration, and skip prewarming for unsupported or network-managed cases.
- Cancel outstanding prewarming during shutdown. Keep failed speculative
  captures retryable by real commands without consuming their retry budget.

## Testing

Added coverage for non-blocking capture and reuse, failure recovery, sandbox and
permission isolation, shutdown cancellation, hook-stopped turns, eligibility
gates, and concurrent capture retries.

GitOrigin-RevId: ff24a4f0328c06653e09d03fd0a3db1eccd65030

2026-09-01 21:16:12 +00:00

..

common

Harden core test fixture startup assertions (#41194)

2026-08-27 19:58:09 +00:00

fixtures

Organize bundled Rust resources under asset directories (#41477)

2026-08-29 06:05:28 +00:00

remote_env_windows

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

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

suite

Prewarm shell snapshots for eligible turns (#42137)

2026-09-01 21:16:12 +00:00

all.rs

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

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

responses_headers.rs

Sanitize credentials from Git remote metadata (#40713)

2026-08-25 21:34:05 +00:00