Classified only marked browser failures and evaluated-run stack frames as run-owned rejections. Unrelated tab-worker failures now remain on the worker guard's fatal path.
Observed Promise.all and Promise.race results derived from browser calls during each evaluated run. User catch continuations that rethrow browser failures now fail the owning run without changing native await behavior.
Tracked whether user continuation callbacks create each descendant rejection. Browser errors that user code rethrows now fail the owning run instead of being contained as propagated helper failures.
Scoped browser-error markers to each run and contained only propagated browser failures. Routed floated user continuations into failed runs and added worker coverage for native await plus every continuation method.
Observed every browser facade continuation so fire-and-forget helper
timeouts cannot wedge or kill a tab worker. Preserved native Promise
identity for callers and test matchers.
- Serialized group and ungroup operations to prevent duplicate tab group creation races.
- Queued and serially drained tab grouping requests in the relay bridge to prevent overlapping RPCs.
- Mirrored tab group titles to session storage and healed duplicate groups during background service worker recovery.
- Renamed run-cancellation utility to run-scope and updated corresponding module and test references.
- Enhanced `wait()` in browser tools to accept a predicate function in addition to milliseconds.
- Implemented automatic polling with configurable timeout and interval, resolving with the first truthy value.
- Throws a descriptive `ToolError` on timeout instead of waiting for the full execution deadline.
- Added comprehensive unit tests to verify polling behavior, cancellation, and error handling.
- Added comprehensive test suite for `postmortem` utility error handling, covering cleanup symbol marking, cause chain depth validation, and process exception suppression.
- Added tests for `browser-run-cancellation` ensuring proper `unhandledRejection` suppression and correct `ToolAbortError` propagation during teardown.
- Implemented `collectUnhandledRejections` helper to verify silence of process-level rejections during async race conditions in browser runs.
- Added integration-style probe tests for `postmortem` to verify that marked cleanup errors allow process survival while unmarked ones remain fatal.
Wrapped cmux page, browser, and tab globals with per-run abort checks so stale continuations cannot reuse the long-lived CmuxTab after timeout.
Fixes#3964
can1357