test: retain execution lifetime failure observations

Review threads live on the whole diff, not on one commit, so none are shown here - a thread's line means something in the branch's final form, and painting it into an intermediate step would put it on code it is not about.

docs/public-safety-execution.mdmodified+2-1

Changes to docs/public-safety-execution.md

		⋯117 linesShow the 117 lines above this hunk@@ -118,7 +118,8 @@ elapsed deadlines, stream capacity, cleanup and durable COMMIT with a withheld
118	118	response. The existing workspace browser scenarios remain required regressions.
119	119
120	120	The native lifetime fixture emits bounded phase observations around setup,
121		-authority reads, retention waits and cleanup. Its parent records the observed
	121	+authority reads, retention waits and cleanup. Parent-start and child-runtime
	122	+records identify their Bun versions and executable paths independently. Its parent records the observed
122	123	exit code and signal separately from whether its own watchdog fired or cleanup
123	124	requested a kill. The settled `exited` status is distinct from the raw
124	125	`exitCode` property, which can remain null after a signal. Elapsed time includes process work and output handling, not

tests/fixtures/public-safety-access/execution-lifetime.tsmodified+1-0

Changes to tests/fixtures/public-safety-access/execution-lifetime.ts

		⋯3 linesShow the 3 lines above this hunk@@ -4,6 +4,7 @@ import { setupExecutionLifetime } from './execution-lifetime-setup'
4	4	const mode = Bun.argv[2]
5	5	assert(mode === 'completed' || mode === 'canceled' || mode === 'quarantine')
6	6	const began = performance.now()
	7	+console.log(JSON.stringify({ oracle: 'lifetime-fixture-runtime', mode, bunVersion: Bun.version, executable: process.execPath, platform: process.platform, arch: process.arch }))
7	8	let observations = 0
8	9	async function observe<T>(phase: string, work: () => Promise<T>): Promise<T> {
9	10	const emit = (outcome: 'began' | 'settled' | 'rejected') => {

tests/unit/public-safety-execution-lifetime.test.tsmodified+1-1

Changes to tests/unit/public-safety-execution-lifetime.test.ts

		⋯26 linesShow the 26 lines above this hunk@@ -27,7 +27,7 @@ for (const mode of ['completed', 'canceled', 'quarantine']) test(`native executi
27	27	console.error('LIFETIME_FIXTURE_DEADLINE', JSON.stringify({ mode, pid: running.pid, timeoutMs: 90000, elapsedMs: performance.now() - began, requestedSignal: 'SIGKILL' }))
28	28	}, 90000)
29	29	try {
30		- console.log(JSON.stringify({ oracle: 'lifetime-fixture-start', mode, pid: running.pid, timeoutMs: 90000 }))
	30	+ console.log(JSON.stringify({ oracle: 'lifetime-fixture-start', mode, pid: running.pid, timeoutMs: 90000, parentBunVersion: Bun.version, childExecutable: process.execPath }))
31	31	const [code, stdout, stderr] = await Promise.all([exited, new Response(running.stdout).text(), new Response(running.stderr).text()])
32	32	// eslint-disable-next-line no-console
33	33	for (const line of stdout.split('\n')) if (line.startsWith('{"oracle":')) console.log(line)