test: fold per-incident replay series into their detector owners (D)

Twelve detector families move into one owner test each: 73 incident files
become describe blocks in ceo-section-loading-fixture (stale-fill race),
model-overlays, coverage-audit-evidence, autoplan-phase-observer,
native-auto-decide, outside-voice-evidence, eng-first-review,
plan-count-completion, plan-count-file-permission, ceo-mode-option,
plan-scope-selection and plan-count-prerequisite. Each block keeps its original
code and fixture, so every case still runs; only tests asserting the incident
file's own touchfile registration are dropped (41). Touchfile lists that named
an incident now name its owner.

test/paid-overlay-scheduling.test.ts

@@ -62,7 +62,7 @@ describe('overlay file policy', () => {
       expect(buildPaidShardArgs([file], resolvePaidShardTimeoutMs([file]), 2, retriesForFiles([file])))
         .toContain('--timeout=1830000');
     }
-    for (const file of [normalFile, 'test/skill-e2e-overlay-harness.test.ts', 'test/model-overlay-opus-4-7.test.ts']) {
+    for (const file of [normalFile, 'test/skill-e2e-overlay-harness.test.ts', 'test/model-overlays.test.ts']) {
       expect(isOverlayTestFile(file)).toBe(false);
       expect(resolvePaidShardTimeoutMs([file])).toBe(DEFAULT_SHARD_TIMEOUT_MS);
       expect(retriesForFiles([file])).toBe(1);