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>
Implements plan items A1, A3 (J1 only) and the minimal A4 from
.plans/2026-09-25-performance-journeys-ratchet.md.
- journey-renderer-probe.ts: init-script probe counting DOM mutations,
layout shifts and long tasks until the first source card is visible on
/workspace with the splash removed; unit-tested with jsdom fixtures.
- journey-main-ipc-capture.ts: counts bridge invocations from the preload's
renderer-API trace channel up to a sentinel call the probe fires, so the
IPC counter is exact without touching production code.
- launch.journey.ts + playwright.journeys.config.ts: seeded profile (one
M3U source, one Xtream portal on the loopback mock), one warm-up and five
measured iterations, fresh process and data directory each, writing
dist/performance/journeys/<timestamp>/summary.json with exact counters
and P50/P90 wall-clock.
- Nx target electron-backend-e2e:journeys and root script perf:journeys.
- docs/architecture/performance-journeys.md, README, context and
validation map entries.
renderer.cdTicksToFirstCard and main.sqlStatementsBeforeReadyToShow are
reported as unavailable with the reason instead of being faked.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
