test: clean up the paid eval lane (B1-B4, B6, B7)

- B1: delete paid files that assert nothing or cannot pass meaningfully:
  skill-llm-eval-spec and skill-e2e-spec-execute (test.todo), gemini-e2e
  (+ gemini-session-runner; no gemini CLI in CI), ship-idempotency (red
  since v1.63), the two opus-4-7 *-sonnet overlay wrappers, conductor-prose
  (+ its source-evaluation replay), codex-e2e-plan-format; drop their keys,
  scripts and census rows.
- B2: skill-llm-eval grades browse/sections/command-list.md with one union
  judge that also carries the baseline score pin; regression-vs-baseline
  deleted (paid run: pass, c4/c4/a4).
- B3: memory-pipeline, ios-qa, ios-qa-swift-build and plan-tune-cathedral
  make no model calls; renamed out of the paid glob so they run on every
  PR. Swift builds need GSTACK_TEST_SWIFT=1; device stub deleted.
- B4: codex-e2e*, outside-voice, aside and ios-device cannot run in the CI
  image; excluded from the weekly lane with a tracked re-entry condition.
- B6: fold opus-47's negative routing controls into skill-routing-e2e
  journey-negatives (paid run: 3/3 unrouted) and delete the file.
- B7: delete the never-green brain-privacy-gate eval; a free
  gstack-skill-start test now proves consent precedes artifacts egress.

test/plan-design-sdk-fixture.test.ts

@@ -11,9 +11,9 @@ const ROOT = path.resolve(import.meta.dir, '..');
 const source = fs.readFileSync(path.join(ROOT, 'test/skill-e2e-design.test.ts'), 'utf8');
 const id = 'plan-design-review-plan-mode';
 
-// Same source-evaluation pattern as plan-tune-cathedral-fixture.test.ts: run
-// the real suite registration and selected callback, without importing paid
-// initialization. All filesystem mutations stay in this standalone fixture.
+// Source-evaluation pattern: run the real suite registration and selected
+// callback, without importing paid initialization. All filesystem mutations
+// stay in this standalone fixture.
 async function exercise(mode: 'success' | 'max-turns' | 'first-timeout' | 'second-timeout' | 'saved-timeout' | 'empty-summary' | 'write-failure' | 'unchanged-seed' | 'no-additions' | 'short-plan' | 'api-error' | 'plan-read-failure' | 'attempt-deadline') {
   const scratch = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'legacy-design-free-')));
   const home = path.join(scratch, 'home'); fs.mkdirSync(home);