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Review target: GitHub pull request 1724.

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Done. Summary:

PR feedback applied (commit 4975ded86, pushed):

Six platform files (telemetry/detached_{unix,windows,other}.go + trail_refresh_detached_{unix,windows,other}.go) collapsed into one portable execx.SpawnDetached(dir, args...). Reuses existing detachFromTTY, so no third copy of SysProcAttr logic.
Includes testing.Testing() no-op guard — in-process unit tests can never fork the test binary. This closed a real pre-existing hazard: any test hitting TrackCommandDetached with a visible command would have re-exec'd the whole test suite detached.
Net: -238/+87 lines.

Issue refs stripped: all #450 mentions gone from code comments, test comments, failure messages, and PR body (rewrote prose to describe symptom instead). Two caveats:

Dropped Fixes #450 from PR body per "anywhere" — issue will NOT auto-close on merge. Re-add if you want closure linkage.
Older commit messages on branch still say #450 (3aa23f49b, 95dd5a550). Rewriting means force-push mid-review; squash-merge erases them anyway. Left alone.

Test duplication check: no overlap with existing suite. TestTrailEnablementCache_ReadsClonePreference covers cache read/scope/TTL; TurnStart injection tests cover consumption. The 7 new tests each assert distinct behavior (spawn seam, refresh timeout bound, exit-0, file logging, no stray logs, throttle semantics, throttle wiring). Only soft overlap: ThrottlesWithinWindow's first two assertions are implied by CollapsesBurst, but the window-boundary re-record cases are unique — keep both.

Behavior changes from the refactor (deliberate, flagging):

Unix detach: Setpgid → Setsid (full session detach, matches NonInteractive semantics — strictly stronger).
Telemetry child cwd: / (unix) / os.TempDir() (windows) → os.TempDir() everywhere.

Verification: mise run fmt clean, golangci-lint 2.11.3 (mise binary direct, per stale-shadow note) 0 issues, go build ./... + GOOS=windows cross-build clean, full ./cmd/entire/cli/... test tree green.

Review verdict on rest of PR: solid. Detached-spawn pattern matches telemetry precedent, throttle flock keyed to git-common-dir is correct for multi-worktree, child re-checks cache before dialing, mutation-verified tests are load-bearing. One minor known quirk: throttle marker is written before the spawn attempt, so a failed os.Executable()/Start() suppresses retry for one 3s window — self-heals, not worth code.