fix(security): keep only the regex sanitization; drop non-functional CodeQL annotations

The lgtm[]/nosemgrep: comments in codexIdentity.ts and reasoningCache.ts use
formats GitHub Actions CodeQL does not honor, and shifting those sha256 lines
re-attributed the already-dismissed base alerts to this PR as two new CodeQL
findings. Revert those two annotation-only files to base so the existing
dismissals apply; retain the real fix (escaping backslash in the test regex),
which resolves the open js/incomplete-sanitization alert.

tests/unit/early-sse-route-intent.test.ts

@@ -22,7 +22,7 @@ const ROUTES = [
 
 for (const route of ROUTES) {
   test(`${route.name} early-heartbeat gate uses the real stream resolver`, () => {
-    const escapedBodyExpression = route.bodyExpression.replace(/[?.]/g, "\\$&");
+    const escapedBodyExpression = route.bodyExpression.replace(/[.?\\]/g, "\\$&");
     assert.match(
       route.source,
       new RegExp(