Add label configuration for repository workflow management

[Copilot]

Adds structured label taxonomy for issue and PR categorization.

Changes

• .github/labels.yml - Machine-readable label definitions (25 labels)

  • Feature area labels: cli, automation, readme-parsing, workspace, git-integration
  • Phase labels: phase:fetch through phase:cleanup (mirrors 7-phase execution model in cmd/run.go)
  • Standard workflow labels: issue types, priorities, status markers

• .github/LABELS.md - Label usage reference

  • Category descriptions and application guidelines
  • Sync instructions for github-label-sync, GitHub Actions, or manual application

Label Structure

Phase labels map directly to execution phases:

- name: "phase:fetch"      # Phase 1: Fetch/Workspace
- name: "phase:scan"       # Phase 2: Scan
- name: "phase:plan"       # Phase 3: Plan (AI)
- name: "phase:validate"   # Phase 4: Validate/Normalize
- name: "phase:prerequisites" # Phase 5: Prerequisites
- name: "phase:execute"    # Phase 6: Execute
- name: "phase:cleanup"    # Phase 7: Post-run/Cleanup

Unique colors per phase for visual differentiation. Sync via: npx github-label-sync --access-token $GITHUB_TOKEN sony-level/readme-runner .github/labels.yml

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