#4244 test(apple): wait for the owner lookup's spawns by event, not a turn count

Summary

• launch-confirmation.test.ts waited for the owner lookup's second spawn with a 1000-turn setImmediate loop. Under coverage on a loaded CI runner the lookup had not spawned at all after those turns (expected +0 to be 2), so the Coverage job failed on unrelated PRs: it is the failing test in Coverage on 5 of the last 6 failed CI runs I checked, including #4231.
• The test now resolves a promise when the second spawn happens, and fails fast if the lookup finishes before it. The same change is bundled in #4225; this lands it alone so other PRs stop failing. #4225 can drop the identical hunk on rebase.
• 1 file changed. Test-only.

Validation

• Tested SHA: 0ffc0d7c3459b0b3028fdba516902987c3fbd6d2
• pnpm check:affected --run --head 0ffc0d7c3459b0b3028fdba516902987c3fbd6d2: format, lint, typecheck, layering, fallow, vitest-related and unit passed.
• The test file passed 15 plain runs and 5 runs under coverage with 12 CPU-burning processes.
• Not reproduced locally: the old version also passed 5 loaded coverage runs on macOS. The failure is CI-only (Linux); the fix removes the turn bound rather than tuning it.

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