chore: refactor agent configurations and update testing instructions

- Updated QA Security agent to use GPT-5.2-Codex and expanded toolset for enhanced functionality.
- Revised Supervisor agent to utilize GPT-5.2-Codex and improved toolset for code review processes.
- Modified architecture instructions to specify running Playwright tests with Firefox.
- Adjusted copilot instructions to run Playwright tests with Firefox as the default browser.
- Created documentation for coding best practices to ensure consistency and quality in project documentation.
- Established HTML/CSS style color guide to maintain accessible and professional design standards.
- Updated Playwright TypeScript instructions to reflect the change in default browser to Firefox.
- Enhanced testing instructions to clarify integration testing processes and default browser settings.
- Updated integration test scripts to align with CI workflows and improve clarity in execution.
- Created new integration test scripts for Cerberus, rate limiting, and WAF functionalities.
- Adjusted E2E testing scripts to default to Firefox and updated documentation accordingly.
- Modified GitHub Actions workflow to run the comprehensive integration test suite.

.github/skills/test-e2e-playwright-coverage-scripts/run.sh

@@ -26,7 +26,7 @@ source "${SKILLS_SCRIPTS_DIR}/_environment_helpers.sh"
 PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"
 
 # Default parameter values
-PROJECT="chromium"
+PROJECT="firefox"
 VITE_PID=""
 VITE_PORT="${VITE_PORT:-5173}"  # Default Vite port (avoids conflicts with common ports)
 BACKEND_URL="http://localhost:8080"
@@ -52,7 +52,7 @@ parse_arguments() {
                 shift
                 ;;
             --project)
-                PROJECT="${2:-chromium}"
+                PROJECT="${2:-firefox}"
                 shift 2
                 ;;
             --skip-vite)
@@ -84,7 +84,7 @@ API calls to the Docker backend at localhost:8080.
 
 Options:
     --project=PROJECT   Browser project to run (chromium, firefox, webkit)
-                        Default: chromium
+                        Default: firefox
     --skip-vite         Skip starting Vite dev server (use existing server)
     -h, --help          Show this help message