## Why
Tests need to distinguish slow subprocess startup from operation timeouts and wait for asynchronous work before asserting results or cleaning up fixtures.
## What changed
- Synchronize subprocess readiness, queued-turn completion, and matching UI events; allow more time for cold startup and separate startup from shutdown deadlines.
- Adapt Windows fixtures and permission expectations, provide the voice-host test runtime DLL path, and normalize platform paths and animated status snapshots.
- Use current configuration permissions when changing directories in embedded TUI sessions, while retaining saved permissions for remote sessions.
- Allow the release prompt-prefix comparison to accept the exact image-tool description update that removes image detail options, and refresh the corresponding tool snapshot.
## Testing
Extend inherited-session metadata coverage to both legacy and paginated thread history, including persisted history mode and revision-aware resume.
GitOrigin-RevId: 0afb38403fc0adb0d83175344749584f0cdf9979
## Why
Detect changes to the default model-visible prefix relative to a released CLI, requiring those changes to be gated behind a default-off feature key.
## What changed
Add `prompt_prefix_matches_release` to compare instructions, tools, and input preceding the user message using the same client and inputs. Each binary uses its bundled model catalog and feature defaults. The comparison removes response item IDs and transport metadata and normalizes fixture paths and session identifiers while preserving prompt text, whitespace, tool descriptions, schemas, and array ordering.
Use the released binary supplied by `CONTRACT_EXECUTOR_BIN` when available; otherwise, compare two runs of the current binary to check determinism.
GitOrigin-RevId: 1a69fb3abb6fc3df90a095e01bcf0d5de1818fac
felixxia-oai