Per-run log folders for agent grep/analysis

[dimos-bot]

Change logging architecture to create separate log folders PER run/process:

• Each dimos run creates unique log directory (e.g., logs/run-<timestamp>-<pid>/)
• Logs persist after process stops for post-mortem analysis
• Agent can grep/analyze logs by run ID
• Include metadata file (blueprint, start time, PID, etc.)

Context: Agent needs to analyze logs from previous runs to debug failures and validate success.

Success criteria:

• logs/run-20260310-143022-12345/ directory structure
• Logs remain after dimos stop
• Easy to reference by PID or timestamp

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Synced from DIM-666