Eric Traut ac192cd793 Allow guarded legacy resume with background migration enabled (#43178) ...

## Why

Enabling background rollout migration disabled the TUI's cached legacy resume shortcut, even when the rollout maintenance lock could prevent migration during resume.

## What changed

Allow embedded sessions to use the shortcut regardless of migration feature settings when they acquire the maintenance lock and revalidate that the thread still uses legacy history. Hold the lock through `thread/resume` so the response can safely include turns. Remove the session's cached startup migration setting.

## Testing

Update the regression test to cover all four combinations of startup and workspace migration settings, checking lock acquisition before metadata revalidation, a two-request resume, and nonempty history.

GitOrigin-RevId: cf525a6edb813050469dff39b83e5e61214485a1

2026-09-06 07:42:32 +00:00

..

assets

Organize bundled Rust resources under asset directories (#41477)

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

frames

Rename tui_app_server to tui (#16104)

2026-03-28 11:23:07 -06:00

src

Allow guarded legacy resume with background migration enabled (#43178)

2026-09-06 07:42:32 +00:00

tests

Make the TUI symlink startup test Bazel-compatible (#42741)

2026-09-04 11:43:37 +00:00

BUILD.bazel

Make the TUI symlink startup test Bazel-compatible (#42741)

2026-09-04 11:43:37 +00:00

Cargo.toml

Add a helper-backed realtime WebRTC session API (#43097)

2026-09-05 20:39:46 +00:00

styles.md

Rename tui_app_server to tui (#16104)

2026-03-28 11:23:07 -06:00