## What changed
Add `ReviewExecution` observers and an optional `auto_review_overhead` subcomponent to `PathDurations`. Compute overhead by subtracting the union of observed child execution intervals from automatic review time, clipping intervals to the selected path segments and requested window.
Track concurrent and retried submissions, preserve unknown attribution for incomplete or unobserved execution, and allow observations to be sealed against late callbacks.
## Testing
Add unit coverage for overlapping execution, window clipping, human waits, cached reviews, losing parallel paths, canceled submissions, and sealed observations.
GitOrigin-RevId: 73ebe5ed9100a6598f28099ba46cc6d76578d8d9
## What changed
- Report sampling and compaction separately as `critical_path_sampling_ms` and `critical_path_compaction_ms`, retaining `critical_path_inference_ms` as their combined compatibility total.
- Enable critical path capture for subagent and Guardian turns when `CriticalPathTiming` is enabled, while continuing to exclude memory consolidation sessions.
- Preserve capture across incoming agent messages and support direct `spawn_agent` and `wait_agent` calls. Attribute these calls to the parent's tool time and keep child work on the child's own turn.
## Testing
Add runtime coverage for independent parent/child timing, incoming agent messages, Guardian turns, feature gating, and memory consolidation exclusion. Update phase accounting and analytics tests to cover the new fields and millisecond truncation.
GitOrigin-RevId: 09d4c0b853e817216bed173e4404d0d782de97ec
## What changed
Add `codex-utils-critical-path` to track shared dependency paths and attribute time to inference, automatic review, user waits, tools, overhead, and unknown work. Parallel joins retain the later-finishing branch, preserving its full history without double-counting overlapping work.
Clip attribution to the requested interval and count unrecorded gaps as overhead. Bound retained history by collapsing it into unknown work at the depth limit, with nonrecursive destruction and bounded debug output.
## Testing
Add unit tests for parallel joins, nested dependencies, ties, user waits, interval clipping, overlapping segments, history exhaustion, and safe formatting and concurrent release on small stacks.
GitOrigin-RevId: 2df7453162491d3ae97bf4bee942730c8a4d5e5c
taohong-oai