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/fixtures/overlay-nudges.ts

@@ -305,50 +305,6 @@ export const OVERLAY_FIXTURES: OverlayFixture[] = [
     pass: lowerIsBetter20Pct,
   },
 
-  {
-    id: 'opus-4-7-effort-match-trivial-sonnet',
-    overlayPath: 'model-overlays/opus-4-7.md',
-    model: 'claude-sonnet-4-6',
-    trials: 10,
-    concurrency: 3,
-    direction: 'lower_is_better',
-    maxTurns: 8,
-    setupWorkspace: (dir) => {
-      fs.writeFileSync(
-        path.join(dir, 'config.json'),
-        '{"name": "demo", "version": "1.0.0"}\n',
-      );
-    },
-    userPrompt: "What's the version in config.json? Return only a JSON object with the version key and its exact string value. " +
-      "The final message is consumed directly by JSON.parse: return the exact JSON object, with no Markdown fences and no other prose.",
-    metric: reportedThinkingTokens,
-    metricName: 'reported_thinking_tokens',
-    verify: (r) => assertFinalJson(r, { version: '1.0.0' }),
-    comparison: { direction: 'lower_is_better', minimum: 0 },
-    pass: lowerIsBetter20Pct,
-  },
-
-  {
-    id: 'opus-4-7-literal-interpretation-sonnet',
-    overlayPath: 'model-overlays/opus-4-7.md',
-    model: 'claude-sonnet-4-6',
-    trials: 10,
-    concurrency: 3,
-    direction: 'higher_is_better',
-    allowedTools: ['Read', 'Glob', 'Grep', 'Bash', 'Edit', 'Write'],
-    maxTurns: 15,
-    setupWorkspace: setupLiteralWorkspace,
-    userPrompt: 'Fix the failing tests. Preserve the specified behavior and repair the implementation.',
-    metric: (_r, dir, deadlineAt) => {
-      if (!dir) throw new Error('literal fixture metric needs its workspace');
-      return correctLiteralTargets(dir, deadlineAt);
-    },
-    metricName: 'correct_target_behaviors',
-    taskCorrect: (metric) => metric === 3,
-    allowedChanges: ['src/auth.ts', 'src/billing.ts', 'src/notifications.ts'],
-    comparison: { direction: 'higher_is_better', minimum: 0, maximum: 3 },
-    pass: higherIsBetter20Pct,
-  },
 ];
 
 // Validate at module load so a broken fixture fails fast at test startup,