# C3 — paired runtime comparison

**Outside the PR title:** Same-cwd replacement cancels an earlier lookup; scope ownership moves to the observer.

Before: Node v26.13.0; Linux 6.1.102 x64; full SHA `575579d68ac4bae09f8426a345d4a3eac1e90c67`; driver SHA-256 `034f3987d859f1e100a9432c60e0ff0639317adde5e26e3bec2fdae6cc6e4cba`; common SHA-256 `e43e8b93068d4ac02cae49a11a057268a03a0de0c9c937cbbcd7cb96cc5f8fc9`; fake CLI SHA-256 `8fafbfd9bb1f30cde0838aed8c812080c08545a52038248c3da332ca002930b8`. Start 2026-11-03T00:48:21.886Z.

After: Node v26.13.0; Linux 6.1.102 x64; full SHA `796cfdf664f87bf46a6b202976c50c22158b83b0`; driver SHA-256 `034f3987d859f1e100a9432c60e0ff0639317adde5e26e3bec2fdae6cc6e4cba`; common SHA-256 `e43e8b93068d4ac02cae49a11a057268a03a0de0c9c937cbbcd7cb96cc5f8fc9`; fake CLI SHA-256 `8fafbfd9bb1f30cde0838aed8c812080c08545a52038248c3da332ca002930b8`. Start 2026-11-03T00:48:37.475Z.

All timestamps are UTC with monotonic milliseconds from this transcript’s environment event. Service bundles are harness captures using revision-owned real layers, synthetic dependencies and state.

| Row | Before | After | Verdict |
|---|---|---|---|
| F08 | 2026-11-03T00:48:22.043Z (+158.699 ms) — CLI_START F08-R1 active=1, peak=1<br>2026-11-03T00:48:22.047Z (+161.943 ms) — REPLACEMENT_SNAPSHOT<br>2026-11-03T00:48:22.048Z (+163.401 ms) — CLI_END F08-R1 active=0, peak=1<br>2026-11-03T00:48:22.061Z (+176.154 ms) — FINALIZE_RETURN F08 R1<br>2026-11-03T00:48:22.102Z (+217.625 ms) — CLI_START F08-R2 active=1, peak=1<br>2026-11-03T00:48:22.104Z (+218.907 ms) — CLI_END F08-R2 active=0, peak=1<br>2026-11-03T00:48:22.112Z (+227.624 ms) — FINALIZE_RETURN F08 R2<br>2026-11-03T00:48:22.112Z (+227.793 ms) — PUBLICATION_SEQUENCE F08 F08-R1,F08-R2 | 2026-11-03T00:48:37.566Z (+92.227 ms) — FINALIZE_RETURN F08 R1<br>2026-11-03T00:48:37.643Z (+169.149 ms) — CLI_START F08-R1 active=1, peak=1<br>2026-11-03T00:48:37.652Z (+178.509 ms) — FINALIZE_RETURN F08 R2<br>2026-11-03T00:48:37.653Z (+179.091 ms) — CLI_INTERRUPT F08-R1 active=0, peak=1<br>2026-11-03T00:48:37.705Z (+231.546 ms) — CLI_START F08-R2 active=1, peak=1<br>2026-11-03T00:48:37.707Z (+233.111 ms) — CLI_END F08-R2 active=0, peak=1<br>2026-11-03T00:48:37.718Z (+244.530 ms) — PUBLICATION_SEQUENCE F08 F08-R2 | Captured; expected behavior |
| F10 | 2026-11-03T00:48:22.165Z (+280.096 ms) — CLI_START F10-A active=1, peak=1<br>2026-11-03T00:48:22.214Z (+329.136 ms) — CLI_START F10-B active=2, peak=2<br>2026-11-03T00:48:22.216Z (+331.400 ms) — CLI_END F10-B active=1, peak=2<br>2026-11-03T00:48:22.225Z (+339.910 ms) — FINALIZE_RETURN F10 R2<br>2026-11-03T00:48:22.225Z (+340.165 ms) — INDEPENDENCE_SNAPSHOT<br>2026-11-03T00:48:22.226Z (+341.023 ms) — CLI_END F10-A active=0, peak=2<br>2026-11-03T00:48:22.236Z (+350.993 ms) — FINALIZE_RETURN F10 R1 | 2026-11-03T00:48:37.727Z (+253.260 ms) — FINALIZE_RETURN F10 R1<br>2026-11-03T00:48:37.769Z (+295.505 ms) — CLI_START F10-A active=1, peak=1<br>2026-11-03T00:48:37.772Z (+298.044 ms) — FINALIZE_RETURN F10 R2<br>2026-11-03T00:48:37.819Z (+345.523 ms) — CLI_START F10-B active=2, peak=2<br>2026-11-03T00:48:37.820Z (+346.673 ms) — CLI_END F10-B active=1, peak=2<br>2026-11-03T00:48:37.830Z (+356.602 ms) — INDEPENDENCE_SNAPSHOT<br>2026-11-03T00:48:37.831Z (+357.520 ms) — CLI_END F10-A active=0, peak=2 | Captured; expected behavior |
| F11 | 2026-11-03T00:48:22.282Z (+397.806 ms) — CLI_START F11-scope active=1, peak=1<br>2026-11-03T00:48:22.283Z (+398.186 ms) — CALLER_BEFORE_SCOPE_CLOSE pending=True, active=1<br>2026-11-03T00:48:22.283Z (+398.290 ms) — SCOPE_CLOSE_BEGIN F11<br>2026-11-03T00:48:22.284Z (+399.562 ms) — CLI_INTERRUPT F11-scope active=0, peak=1<br>2026-11-03T00:48:22.293Z (+408.465 ms) — SCOPE_CLOSED F11 | 2026-11-03T00:48:37.848Z (+374.051 ms) — FINALIZE_RETURN F11 R1<br>2026-11-03T00:48:37.892Z (+418.512 ms) — CLI_START F11-scope active=1, peak=1<br>2026-11-03T00:48:37.893Z (+419.090 ms) — CALLER_BEFORE_SCOPE_CLOSE pending=False, active=1<br>2026-11-03T00:48:37.893Z (+419.222 ms) — SCOPE_CLOSE_BEGIN F11<br>2026-11-03T00:48:37.895Z (+421.256 ms) — CLI_INTERRUPT F11-scope active=0, peak=1<br>2026-11-03T00:48:37.903Z (+429.422 ms) — SCOPE_CLOSED F11 | Captured; expected behavior |

What changed:

- The title does not describe replacement/lifetime changes: a distinct R2 accepted refresh at the same exact cwd interrupts R1 and prevents its cache publication After. Before both calls wait behind the real cwd lock and publish R1 then R2.
- After the lookup outlives its finalize caller and belongs to observer-layer scope. Before the caller remains blocked. Closing scope interrupts the actual child on both sides without gate release or remote publication.
- Different canonical cwd lookups coexist on both sides; B completes while A stays gated. No alias normalization or chronological run-id ordering is claimed.

Unverified required rows: none. These captures do not establish live forge adapter compatibility.