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-auto-decide-preserved.test.ts

@@ -111,7 +111,7 @@ describeE2E('AUTO_DECIDE opt-in preserved under Conductor flags (periodic)', ()
         skillName: 'plan-ceo-review',
         inPlanMode: true,
         extraArgs: ['--disallowedTools', 'AskUserQuestion'],
-        timeoutMs: 300_000,
+        timeoutMs: 540_000,
         env: { GSTACK_HOME: tmpHome, CONDUCTOR_WORKSPACE_PATH: tmpHome },
       });
 
@@ -135,5 +135,5 @@ describeE2E('AUTO_DECIDE opt-in preserved under Conductor flags (periodic)', ()
     } finally {
       try { fs.rmSync(tmpHome, { recursive: true, force: true }); } catch { /* best-effort */ }
     }
-  }, 360_000);
+  }, 660_000);
 });