Integrate PR #28 security and documentation enhancements with yaml-lint reconciliation

[Copilot]

PR #28 introduced YAML linting, secret detection, and workflow documentation but conflicted with PR #29 (already merged to main) on tooling choice: Python's yamllint vs Node's yaml-lint. This PR integrates all PR #28 enhancements while maintaining main's yaml-lint approach.

Security Enhancements

• .env.example: Added security warnings with crypto-based secret generation commands
• .husky/pre-commit: Added regex-based secret detection (API keys, tokens, passwords) and .env file blocking
• SECURITY.md: Added environment file management section covering rotation, log sanitization, and secret management services

Documentation

Added three comprehensive guides:

• docs/workflow-maintenance-guide.md: npm script reference, YAML validation procedures, Node version strategy, troubleshooting
• docs/copilot-codex-configuration-guide.md: AI pair-programming standards, workflow examples, security defaults
• docs/IMPLEMENTATION_SUMMARY.md: Change summary with reconciliation notes

Updated existing docs:

• README.md: Complete npm scripts list (lint:yaml, test:run, check, audit)
• All references updated from yamllint to yaml-lint

CI/CD Fixes

• .github/workflows/ci.yml:
  • Changed npm audit --audit-level=moderate → npm run audit (uses audit-ci config)
  • Fixed bracket spacing: [ main, develop ] → [main, develop]
• .github/workflows/copilot-task.yml: Removed trailing spaces

All YAML files validated with npm run lint:yaml.

Known Pre-existing Issue

CI workflow uses Jest commands but project uses Vitest (documented in IMPLEMENTATION_SUMMARY.md for future fix).

Original prompt

The purpose of this PR is to address the issues in the currently open pull request #28 titled 'Add YAML linting, secret detection, and workflow maintenance documentation' and ensure that it can be successfully merged into the main branch. The following specifics will be addressed:

1. Resolve Merge Conflicts:

   • Sync the current branch copilot/enhance-config-workflow-safety with main.
   • Identify and fix merge conflicts in the affected files.

2. YAML Validation:

   • Confirm and verify that existing .yaml files comply with the new yamllint rules added in PR Add YAML linting, secret detection, and workflow maintenance documentation #28, ensuring syntax correctness and formatting consistency.

3. Security Enhancements:

   • Review and validate the .env.example modifications and new pre-commit hooks for secret detection patterns.
   • Test secret detection functionality using mock data to ensure robust security practices are upheld.

4. Documentation Fixes:

   • Cross-verify the corrected examples in docs/copilot-codex-configuration-guide.md.
   • Review the CONTRIBUTING.md, SECURITY.md, and other documentation files to ensure all additions are complete, accurate, and reflect best practices.
   • Confirm npm script mappings from the docs/workflow-maintenance-guide.md.

5. Test Enhancements:

   • Test the updated CI/CD pipelines to validate the integration of YAML linting as the first gate.
   • Clarify or amend any inconsistencies in testing commands (e.g., Vitest vs Jest, Node version strategy lts/*, etc.).

6. General Review and Refactoring:

   • Perform a comprehensive review of all changes introduced in PR Add YAML linting, secret detection, and workflow maintenance documentation #28, consolidating redundant or conflicting updates and streamlining structure.
   • Maintain continuity with the goals of PR Add Copilot and Codex configuration guide #27, ensuring enhanced safety, planning, and execution of configurations.

7. Update Status:

   • Modify affected files as necessary to fix identified issues or document changes during this process. Push updates to the branch copilot/enhance-config-workflow-safety.

This pull request was created from Copilot chat.

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