Migrate dispatcher agent output to .agents/agents and clean up legacy .github/agents path

[Copilot]

✨ Enhancement

The init flow now writes the agentic-workflows dispatcher to the standard agent-agnostic location: .agents/agents/agentic-workflows.md. This also introduces migration cleanup so repositories stop carrying the legacy .github/agents dispatcher files.

What does this improve?
Moves dispatcher storage to the new canonical agent location and removes stale legacy dispatcher artifacts during fix/migration flows.

Why is this valuable?
Standardizes agent placement across tooling and prevents drift between old and new dispatcher paths.

Implementation approach:

• Dispatcher write target moved

  ensureAgenticWorkflowsDispatcher now writes to:

  • .agents/agents/agentic-workflows.md
    instead of:
  • .github/agents/agentic-workflows.agent.md

• Init/help text aligned with new path

  CLI init command documentation now references the new dispatcher location.

• Download source migration with fallback

  Dispatcher download now prefers the new upstream file path and falls back to the legacy path for compatibility during transition.

• Codemod/cleanup of legacy dispatcher files

  Legacy dispatcher files are now removed during cleanup/migration:

  • .github/agents/agentic-workflows.agent.md
  • .github/agents/agentic-workflows.agents.md

• Cleanup behavior covered in existing codemod tests

  Legacy file deletion scenarios were added to codemod cleanup tests.

targetDir  := filepath.Join(gitRoot, ".agents", "agents")
targetPath := filepath.Join(targetDir, "agentic-workflows.md")