Aidd create prompt

[ericelliott]

feat: Add aidd create --prompt and aidd agent command

This PR introduces the --prompt option to npx aidd create, allowing a one-shot AI agent to run in the new project directory after scaffolding. It also adds a new npx aidd agent subcommand for direct agent invocation.

Why:
To enable immediate AI-driven development post-scaffold and provide a standardized, reusable mechanism for configuring and invoking AI agents across the CLI and programmatic interfaces.

Key Changes:

• Centralized Agent Logic: All agent-related code (config resolution, runner, CLI command, errors) is now collocated under lib/agent-cli/.
• aidd/agent-config & aidd/agent Exports: Provides programmatic access to resolve agent configurations and run agents.
• Unified Agent Resolution: A consistent priority chain (--agentConfig CLI > AIDD_AGENT_CONFIG env > agent-config in aidd-custom/config.yml > default) is used everywhere.
• Manifest Integration: Scaffold manifest prompt: steps now utilize this new, non-interactive agent configuration.
• Breaking Change: The --agent flag on npx aidd create has been renamed to --agentConfig.
• Manifest Validation: Ensures aidd-custom/config.yml is likely present before prompt: steps execute.

  

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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