chore(release): clear release/v3.8.51 base-red gates — docs count, stryker list, lockfile host, stale suppressions, 7 lint regressions (#11502)

Validated in a combined 4-PR batch worktree off release/v3.8.51 tip.
- Every fix individually confirmed against the pristine tip, no runtime behavior change
- typecheck:core, file-size, changelog-integrity, complexity, cognitive-complexity, check:cycles — all OK
- Full-repo lint: 503 → 228 problems, confirming this PR's diagnosis of the exit-2 stale-suppressions + orphaned-code causes; the remaining 228 are pre-existing dashboard react-hooks/* findings this PR never claimed to touch
- node --test tests/unit/combo-routing-engine.test.ts, providers-constants-split.test.ts, and the providerLimits/videoBridge importers — all pass as part of the batch's 246/246 node:test run

Thanks for the meticulous base-red triage — this directly explains and fixes the largest lint-drift finding from the prior merge-batch session.

tests/unit/combo-routing-engine.test.ts

@@ -16,9 +16,8 @@ const {
   handleComboChat,
 } = await import("../../open-sse/services/combo.ts");
 const { resolveComboTargets } = await import("../../open-sse/services/combo/comboStructure.ts");
-const { getComboFailureCount, __resetComboFailureTrackerForTests } = await import(
-  "../../open-sse/services/combo/failureTracker.ts"
-);
+const { getComboFailureCount, __resetComboFailureTrackerForTests } =
+  await import("../../open-sse/services/combo/failureTracker.ts");
 const { applyPromptCacheAffinity } =
   await import("../../open-sse/services/combo/promptCacheAffinity.ts");
 const { resolveReasoningBufferedMaxTokens } =
@@ -1351,11 +1350,10 @@ test("#11408 guard: no-executable-targets early exit still records the combo fai
         retryDelayMs: 1,
       },
     },
-    relayOptions: { sessionId: "sess-guard-11408" } as any,
+    relayOptions: { sessionId: "sess-guard-11408" },
     allCombos: null,
   });
 
-  const payload = (await result.json()) as any;
   assert.equal(result.status, 404);
   // The quota-share slot release must not replace the #5923 silent-stop
   // bookkeeping: the consecutive-failure counter must still advance so the