Implement dreaming (idle-time performance reflection)

[martinjms]

Summary

During idle time, review recent journal entries and optimize future token efficiency. Create tools for repeated patterns, store lessons in memory.

Requirements

• Runs at lowest priority in scheduler, yields to conversations
• Reviews journal: token counts, tool call patterns, redundancies
• Creates tools/skills for repeated multi-step patterns
• Logs reflections to .state/dreams.json
• Depends on: meta-cognition (Implement meta-cognition (pattern recognition + habit formation) #9), journal system (done)

References

• ARCHITECTURE.md — Dreaming (performance reflection + optimisation)