fix(remediation): pass LINK_EXTRACTOR_VERSION_TS to the extraction-lag gate

countExtractionLag omitted versionTs, so its predicate diverged from the
counter it claims to share with doctor's links_extraction_lag check and
the extract --stale walk: pages stamped before an extractor version bump
(links_extracted_at < LINK_EXTRACTOR_VERSION_TS) lagged for doctor and
extract but never tripped the sync.repo/extract.all gate. Pass the stamp;
pin the version-bump arm with a backdated-page test (fails without it).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/core/remediation/context.ts

@@ -8,6 +8,7 @@
 
 import type { BrainEngine } from '../engine.ts';
 import type { RecommendationContext } from '../brain-score-recommendations.ts';
+import { LINK_EXTRACTOR_VERSION_TS } from '../link-extraction.ts';
 
 // Re-export so consumers can `import { RecommendationContext } from '../remediation'`
 // — the canonical RecommendationContext type still lives in
@@ -74,9 +75,13 @@ export async function loadRecommendationContext(
 
 /**
  * Real extraction-lag count — the SAME staleness `gbrain extract --stale`
- * processes (engine.countStalePagesForExtraction). Drives the sync→extract
- * recommendation pipeline; replaces the legacy `health.stale_pages` proxy
- * that no longer reflected real extraction work after the v10 trigger drop.
+ * processes (engine.countStalePagesForExtraction with
+ * versionTs=LINK_EXTRACTOR_VERSION_TS, matching doctor's links_extraction_lag
+ * check — without versionTs, pages stamped before an extractor version bump
+ * would lag for doctor/extract but never trip this gate). Drives the
+ * sync→extract recommendation pipeline; replaces the legacy
+ * `health.stale_pages` proxy that no longer reflected real extraction work
+ * after the v10 trigger drop.
  *
  * Shared by loadRecommendationContext AND the D7 per-step recheck in
  * runRemediation — the recheck MUST refresh this gate alongside getHealth,
@@ -84,7 +89,7 @@ export async function loadRecommendationContext(
  */
 export async function countExtractionLag(engine: BrainEngine): Promise<number> {
   try {
-    return await engine.countStalePagesForExtraction();
+    return await engine.countStalePagesForExtraction({ versionTs: LINK_EXTRACTOR_VERSION_TS });
   } catch {
     /* counter unavailable (very old brain / mid-migration) — treat as 0 */
     return 0;

test/remediation-context-extraction-lag.test.ts

@@ -44,4 +44,19 @@ describe('loadRecommendationContext — extractionLagPages wiring', () => {
     const ctx = await loadRecommendationContext(engine);
     expect(ctx.extractionLagPages).toBeGreaterThan(0);
   });
+
+  it('counts pages stamped before LINK_EXTRACTOR_VERSION_TS (version-bump arm)', async () => {
+    // Backdate p0 so BOTH the NULL arm and the updated_at arm are quiet:
+    // updated_at < links_extracted_at, but links_extracted_at predates the
+    // extractor version stamp. doctor's links_extraction_lag and
+    // `extract --stale` both count this page; the remediation gate must too.
+    await engine.executeRaw(
+      `UPDATE pages SET updated_at = '2020-01-01T00:00:00Z'::timestamptz,
+                        links_extracted_at = '2020-01-02T00:00:00Z'::timestamptz
+        WHERE slug = 'p0'`,
+      [],
+    );
+    const ctx = await loadRecommendationContext(engine);
+    expect(ctx.extractionLagPages).toBeGreaterThan(0);
+  });
 });