feat: add Renovate CLI integration with flexible filtering

- Add renovate.json configuration with Jest-focused settings
- Add npm run renovate script with --filter=<package> support
- Configure proper GitHub token usage via GH_CLI_TOKEN
- Add renovate debug files to .gitignore
- Enable dependency scanning for demo Step 2 completion

Author: loujaybee

.gitignore

@@ -37,3 +37,7 @@ coverage/
 .pgsql/
 
 services/database/database.sqlite
+
+# Renovate debug files
+renovate_debug.txt
+renovate_output.txt