[Infra] Improve CodeQL scanning coverage and schedule

Switch query suite from security-extended to security-and-quality to
match the default GitHub Advanced Security setup. Run scheduled scans
daily instead of weekly. Remove paths-ignore for _experimental/out so
build artifacts are also scanned.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/codeql.yml

@@ -6,8 +6,8 @@ on:
   pull_request:
     branches: [main]
   schedule:
-    # Run weekly on Sundays at 04:00 UTC
-    - cron: "0 4 * * 0"
+    # Run daily at 04:00 UTC
+    - cron: "0 4 * * *"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}