feat: session auto-rotation with optional summary generation

[artemasmith]

Problem

Long-running ClaudeClaw sessions degrade as context fills up — Claude starts contradicting itself and producing lower quality responses. The built-in compression only kicks in near the context limit, not preventing gradual degradation.

Solution

Automatic session rotation based on configurable thresholds:

• Message count — rotates after N messages (default: 50)
• Session age — rotates after N hours (default: 24)

When summaryPath is configured, the expiring session generates a markdown summary before rotating. The latest summary is loaded into the bootstrap prompt of the new session, preserving context continuity.

Changes

• src/sessions.ts — added messageCount to GlobalSession, incremented on each getSession()
• src/config.ts — added SessionConfig interface and parsing
• src/rotation.ts — new file: needsRotation(), rotateSession(), loadLatestSummary()
• src/runner.ts — rotation check before execClaude(), summary loading in bootstrap()
• prompts/SUMMARY.md — prompt template for summary generation

Configuration

New session section in settings.json:

{
  "session": {
    "autoRotate": true,
    "maxMessages": 50,
    "maxAgeHours": 24,
    "summaryPath": "/path/to/summaries"
  }
}

All fields are optional with sensible defaults. When summaryPath is empty (default), rotation happens without summary generation.

Backward Compatibility

• messageCount defaults to 0 for existing sessions via || 0 fallback
• Feature is opt-in: autoRotate defaults to true but does nothing without the config section
• No changes to existing behavior when session config is absent

[miraculix95]

sounds awesome ... like a great idea ... how does the dev_process work, you create changes on a branch and then moaz is reviewing them for the next release if time allows?