Add complete PR publishing infrastructure with CI/CD and documentation

[Copilot]

Implements end-to-end PR publishing process infrastructure for the repository.

GitHub Actions Workflows

• ci.yml: Multi-version testing (Python 3.8-3.12), linting (flake8/black/isort), security scanning (bandit/safety), coverage reporting
• release.yml: Automated release creation with changelog generation on version tags
• pr-checklist.yml: PR description validation, automatic size labeling
• auto-label.yml: Content and path-based automatic labeling
• dependency-review.yml: Dependency vulnerability scanning
• stale.yml: Automated lifecycle management for inactive issues/PRs
• validate-workflows.yml: YAML syntax validation for workflow files

All workflows use explicit minimal permissions for GITHUB_TOKEN.

Documentation Suite

• CONTRIBUTING.md: Contribution guidelines with code standards, commit conventions, testing requirements
• PR_PROCESS.md: Complete PR workflow from creation to merge, including troubleshooting
• QUICK_START.md: Fast onboarding guide with common task examples
• SECURITY.md: Vulnerability reporting process, security best practices, response timeline commitments
• MAINTAINER_GUIDE.md: Operations guide for managing workflows, reviewing PRs, creating releases
• IMPLEMENTATION_SUMMARY.md: Technical implementation details and validation results

Templates & Configuration

• Pull request template with comprehensive checklist covering description, testing, documentation
• Issue templates for bug reports and feature requests with structured sections
• Path-based auto-labeling rules for 17 label categories (core, modules, sectors, docs, tests, etc.)
• Enhanced .gitignore covering Python artifacts, IDEs, Victor-specific patterns

Updated Files

• README.md: Added contributing section, CI/CD information, quick start instructions
• CODE_OF_CONDUCT.md: Contributor Covenant v2.0

Validation

• All workflows validated for YAML syntax
• CodeQL security scanning: 0 alerts
• Explicit permissions added to prevent token overuse
• Total: 2,765 lines added across 20 files

Original prompt

generate and publish complete PR

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.