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dbc518098e
Major changes: - Replace message-count-based memory window with token-budget-based compression - Add max_tokens_input, compression_start_ratio, compression_target_ratio config - Implement _maybe_compress_history() that triggers based on prompt token usage - Use _build_compressed_history_view() to provide compressed history to LLM - Refactor MemoryStore.consolidate() -> consolidate_chunk() for chunk-based compression - Remove last_consolidated from Session, use _compressed_until metadata instead - Add background compression scheduling to avoid blocking message processing Key improvements: - Compression now based on actual token usage, not arbitrary message counts - Better handling of long conversations with large context windows - Non-destructive compression: old messages remain in session, but excluded from prompt - Automatic compression when history exceeds configured token thresholds