test(e2e): periodic-tier repairs from the failure triage

Each fix traces to a receipt: brain-privacy-gate staged config never
reached the hermetic child (ambient GSTACK_HOME is scrubbed) and the
operator's remote-mode gbrain suppressed the gate — both now injected
per-test; ship-idempotency threw away its evidence on the timeout path
and ran a 600s budget its own subject can exceed (now 900s, evidence
captured); auto-decide-preserved gets the same headroom its sibling
plan-ceo tests got; context-skills' hides-checks scanned bash output
where an ls legitimately names old checkpoints (final-text scope now);
design names the missing section instead of a bare count and learns the
easing/duration/micro-interaction synonyms; qa-workflow's collector
afterAll gets an explicit 60s hook timeout.

test/skill-e2e-qa-workflow.test.ts

@@ -406,7 +406,9 @@ Do NOT fix any bugs. Do NOT use AskUserQuestion — just pick vitest.`,
   }, 120_000);
 });
 
-// Module-level afterAll — finalize eval collector after all tests complete
+// Module-level afterAll — finalize eval collector after all tests complete.
+// Explicit 60s timeout: finalize does a JSON save + cross-run comparison and
+// has been observed at 6.26s, past bun's 5s default hook timeout.
 afterAll(async () => {
   await finalizeEvalCollector(evalCollector);
-});
+}, 60_000);