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-scripts/run.sh

@@ -22,7 +22,7 @@ source "${SKILLS_SCRIPTS_DIR}/_environment_helpers.sh"
 PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"
 
 # Default parameter values
-PROJECT="chromium"
+PROJECT="firefox"
 HEADED=false
 GREP=""
 
@@ -35,7 +35,7 @@ parse_arguments() {
                 shift
                 ;;
             --project)
-                PROJECT="${2:-chromium}"
+                PROJECT="${2:-firefox}"
                 shift 2
                 ;;
             --headed)
@@ -71,7 +71,7 @@ Run Playwright E2E tests against the Charon application.
 
 Options:
     --project=PROJECT   Browser project to run (chromium, firefox, webkit, all)
-                        Default: chromium
+                        Default: firefox
     --headed            Run tests in headed mode (visible browser)
     --grep=PATTERN      Filter tests by title pattern (regex)
     -h, --help          Show this help message
@@ -82,8 +82,8 @@ Environment Variables:
     CI                      Set to 'true' for CI environment
 
 Examples:
-    run.sh                              # Run all tests in Chromium (headless)
-    run.sh --project=firefox            # Run in Firefox
+    run.sh                              # Run all tests in Firefox (headless)
+    run.sh --project=chromium           # Run in Chromium
     run.sh --headed                     # Run with visible browser
     run.sh --grep="login"               # Run only login tests
     run.sh --project=all --grep="smoke" # All browsers, smoke tests only