fix(extension): resolve wait_until=commit when the readyState probe fails

[hobostay]

Problem

handleNavigate with wait_until: "commit" can time out for the full timeout_ms instead of resolving on commit, on cross-origin navigations.

The Page.frameNavigated handler called acceptLifecycleEvent without the frame's loaderId:

if (targetName === "commit" && method === "Page.frameNavigated") {
  const p = params as { frame?: { id?: string; parentId?: string } };
  ...
  if (!acceptLifecycleEvent("commit", p.frame?.id)) return;   // no loaderId
  ...
}

Once Page.navigate resolves, the loader guard always carries the new loaderId, so eventLoaderIsRelevant(undefined, guard) hits the expected.length > 0 && !eventLoaderId branch and rejects the commit event outright (every time).

This was masked in the common case because the document.readyState probe short-circuits first (lifecycleAlreadyReached("loading" | "interactive", "commit") is true). But on a cross-origin navigation the probe returns null — the old execution context is destroyed, so the Runtime.evaluate throws — and the wait falls back to Page.frameNavigated, which is then rejected. Result: the commit wait runs to timeout_ms (default 30s).

Fix

Pass the frame's loaderId through, exactly as the sibling Page.lifecycleEvent branches already do (navigation.ts lines that call acceptLifecycleEvent(p.name, p.frameId, p.loaderId)):

const p = params as { frame?: { id?: string; parentId?: string; loaderId?: string } };
...
if (!acceptLifecycleEvent("commit", p.frame?.id, p.frame?.loaderId)) return;

Test

Adds a regression test that makes the readyState probe throw (returns null, simulating the destroyed old execution context of a cross-origin nav) and asserts wait_until="commit" is reached from the Page.frameNavigated event. This test fails on the previous code (reached: "timeout") and passes with the fix. The existing commit test is unaffected (it still resolves via the probe).

Validation

Frontend CI gates run locally against this branch:

• pnpm ext:test — 388 passed ✅
• pnpm --filter @browser-skill/extension compile (tsc --noEmit) ✅
• pnpm lint (biome + stylelint) ✅
• pnpm ext:build ✅

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