feat: transform orchestrator into conversational AI coordinator

[sujayjayjay]

Summary

• Transforms the orchestrator from a documentation-focused prompt to a behavior-focused intelligent coordinator
• Adds issue creation from descriptions: user says "fix the config bug" → orchestrator creates issue + spawns agent
• Adds agent monitoring: orchestrator can peek at tmux sessions and summarize progress
• Adds dependency coordination: "spawn issue 8 after 5,6,7 merge" → orchestrator watches and acts
• Adds proactive behaviors: report progress, suggest cleanup, coordinate automatically

The key insight from #78 is that the orchestrator already runs Claude Code with full CLI access - the issue was that the prompt didn't teach it to act autonomously. This PR gives the orchestrator clear behavioral instructions for:

1. Creating properly-formatted issues from natural language descriptions
2. Monitoring agents by peeking at their terminal output via tmux capture-pane
3. Coordinating dependencies by checking PR states and spawning when ready
4. Being proactive about status updates and cleanup suggestions

Closes #78

Test plan

• Build passes (pnpm build)
• Lint passes (pnpm lint)
• All tests pass (pnpm test)
• Manual test: Run ao start and verify the generated CLAUDE.orchestrator.md has the new conversational format
• Manual test: Verify orchestrator can create issues from descriptions and spawn agents

🤖 Generated with Claude Code

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Command reference shows GitHub issue commands unconditionally

Medium Severity

The "Creating issues from descriptions" section correctly checks isGitHub and provides either gh issue commands or Linear-specific instructions. However, the "Command reference" section unconditionally includes gh issue create, gh issue list, and gh issue view commands regardless of the tracker type. For Linear projects, the orchestrator receives contradictory instructions — one section says "Use the Linear CLI" while the reference section lists gh issue commands.

Additional Locations (1)

• packages/core/src/orchestrator-prompt.ts#L64-L86