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Review follow-up for #1698. - journey-renderer-gate.cjs: a main-process hook loaded with `-r` (the mechanism Playwright uses for its own loader) makes the first loadFile/loadURL navigate to about:blank and holds the real load until the test releases it. Playwright reports no page before a navigation commits, so this is what lets the renderer probe be registered on the page before the real document exists; the IPC capture is installed before the release too. A safety timeout releases the gate on its own and marks the iteration invalid. Unit-tested with a fake BrowserWindow. - launch-journey-app.ts: registers the probe on the parked page, releases the gate, waits for the real document to commit, fails fast when the probe is missing, and refuses an iteration whose gate timed out, saw a second load, or released before the probe was in place. - journey-renderer-probe.ts: entries delivered live after the terminal batch are buffered and filtered by the same cutoff as queued ones, and the cutoff is sampled in a timer queued from the first rAF, i.e. after the card's frame is painted, so the render task's long task and layout shift are consistently included. - launch-journey-record.ts: layoutShiftScore rounded to three decimals; a 0.0001 shift flipped in and out of the cutoff between iterations. - playwright.journeys.config.ts: reuse a mock server left on the journeys port locally (its fixtures are deterministic); CI still starts its own. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>