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-ship-idempotency.test.ts

@@ -158,7 +158,7 @@ describeE2E('/ship idempotency E2E (periodic, real-PTY)', () => {
       const session = await launchClaudePty({
         permissionMode: 'plan',
         cwd: fixture.workTree,
-        timeoutMs: 720_000,
+        timeoutMs: 1_080_000,
         // Disable network-y pieces so the agent can't reach actual github.
         env: { GH_TOKEN: 'mock-not-real', NO_COLOR: '1' },
         seedSkills: true,
@@ -172,7 +172,7 @@ describeE2E('/ship idempotency E2E (periodic, real-PTY)', () => {
         const since = session.mark();
         session.send('/ship\r');
 
-        const budgetMs = 600_000;
+        const budgetMs = 900_000;
         const start = Date.now();
         let lastPermSig = '';
         while (Date.now() - start < budgetMs) {
@@ -234,6 +234,12 @@ describeE2E('/ship idempotency E2E (periodic, real-PTY)', () => {
             break;
           }
         }
+        // Budget exhausted without a terminal signal: capture the tail NOW,
+        // while the session is still alive. Only the break paths above set
+        // evidence — without this, the timeout throw ships evidence: "".
+        if (outcome === 'timeout') {
+          evidence = session.visibleSince(since).slice(-3000);
+        }
       } finally {
         await session.close();
       }
@@ -273,6 +279,6 @@ describeE2E('/ship idempotency E2E (periodic, real-PTY)', () => {
         try { fs.rmSync(path.dirname(fixture.workTree), { recursive: true, force: true }); } catch { /* ignore */ }
       }
     },
-    900_000, // 15 min wall clock
+    1_200_000, // 20 min wall clock
   );
 });