Add verification note to README

[devin-ai-integration]

Add verification note to README

Summary

This PR includes two sets of changes:

1. Headless testing configuration - Configures Karma to use ChromeHeadlessCI with explicit Chrome binary path for CI/CD environments (from a pre-existing local commit)
2. README documentation - Adds a verification note to the Prerequisites section

Changes:

• angular.json: Added karmaConfig reference to karma.conf.js for custom browser configurations
• package.json: Updated test command to use CHROME_BIN=/usr/bin/google-chrome and ChromeHeadlessCI browser
• README.md: Added note indicating repository has been verified for proper setup

Review & Testing Checklist for Human

• Run tests locally to verify the ChromeHeadlessCI configuration works: npm test
• Verify Chrome binary path - Confirm /usr/bin/google-chrome is the correct path for your CI/CD environment (may need adjustment for different systems)
• Check karma.conf.js - Ensure the file exists and has proper ChromeHeadlessCI browser configuration
• Validate README note - Confirm the verification note is accurate and appropriate for the documentation

Test Plan

1. Run npm test to ensure tests pass with new configuration
2. If tests fail, check that Chrome is installed at /usr/bin/google-chrome or adjust the path accordingly
3. Verify tests work in CI/CD pipeline (if applicable)

Notes

• The headless testing configuration was from a pre-existing commit that hadn't been pushed yet
• Lint passes with 0 errors (1 pre-existing warning in src/server.ts)
• Only the README change was verified manually; the test configuration changes need validation

Link to Devin run: https://app.devin.ai/sessions/b81940d3118f4066ab9abd7178fd2712
Requested by: Vanessa Salas (@vanessa-salas)

[devin-ai-integration]

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