feat: add CI/CD workflows and repo configuration

[Rohithgilla12]

Summary

• Add comprehensive CI/CD workflows for this GitHub Actions monorepo
• Set up automated release process with rolling major version tags (standard GitHub Actions pattern)
• Add repository configuration for better contribution workflow

Changes

Workflows

Workflow	Trigger	Purpose
ci.yml	Push/PR to main	Validates action.yml syntax, checks READMEs, lints YAML
release.yml	Manual (workflow_dispatch)	Create releases via GitHub UI with version input
release-on-tag.yml	Push tags v*.*.*	Auto-release when pushing a version tag
pr-labeler.yml	PR events	Auto-labels PRs based on changed files

Configuration Files

• dependabot.yml - Keeps GitHub Action dependencies updated weekly
• CODEOWNERS - Defines code ownership for review routing
• Issue Templates - Bug report and feature request forms
• PR Template - Standardized PR checklist

Release Strategy

Uses unified versioning with rolling major tags (GitHub Actions standard):

• v1.2.0 - Immutable semver tag
• v1 - Rolling tag that always points to latest v1.x.x

Users can reference:

# Get automatic updates (recommended)
- uses: ModernRelay/ralph-claude-code-actions/agentic-ui-tests@v1

# Pin to exact version
- uses: ModernRelay/ralph-claude-code-actions/agentic-ui-tests@v1.2.0

Test plan

• CI workflow runs successfully on this PR
• Verify action.yml validation passes for all 3 actions
• Test release workflow manually after merge