feat(tarko): add built-in agents support

[ulivz]

Summary

Add support for built-in agents in Tarko CLI to resolve agent dependencies without requiring npm package loading.

Built-in agents added:

• agent-tars → resolves to @agent-tars/core
• omni-tars → resolves to @omni-tars/agent
• mcp-agent → resolves to @tarko/mcp-agent

Changes:

• Modified resolveAgentFromCLIArgument to check for built-in agents first
• Added dependencies to agent-cli package.json
• Updated README with built-in agents documentation
• Added console logging when resolving built-in agents

# Before (fails)
tarko run agent-tars  # unable to resolve

# After (works)
tarko run agent-tars  # Using built-in agent: Agent TARS

Other changes

Fix cyclic workspace dependencies at: 7b18251

Checklist

• Added or updated necessary tests (Optional).
• Updated documentation to align with changes (Optional).
• Verified no breaking changes, or prepared solutions for any occurring breaking changes (Optional).
• My change does not involve the above items.

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