* perf(main): add watchdog boundary memory benchmark
Add a repeatable Electron 43 RSS harness that measures the production-built watchdog entry across the child-process and worker-thread boundaries. Record per-trial samples, the median, revision, runtime, and settling procedure for reproducible PR evidence.
* perf(main): move hang watchdog into a worker thread
Keep main-thread hang detection independent of the blocked Electron event loop without paying for a second ELECTRON_RUN_AS_NODE process. Preserve the marker and telemetry contract while moving timing configuration and heartbeats onto a bundled worker entry.
* test(main): smoke packaged hang watchdog worker
* fix(main): make packaged watchdog smoke able to fail
The smoke reported failure only through process.exitCode, but its finally
block quit Electron gracefully, and Electron takes its status from the
browser exit code. Every failure mode — entry missing from app.asar, worker
error, marker timeout, non-zero worker exit — exited 0 with the diagnostic
discarded on stderr, so the required PR check could never go red.
Propagate a real status via app.exit, assert the success line in stdout, and
surface stderr. Verified against a packaged tree with the entry removed:
exit 0 before, exit 1 after.
Co-authored-by: Orca <help@stably.ai>
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Co-authored-by: Orca <help@stably.ai>
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