Implement knowledge_synthesizer.py — a pipeline that picks two
unrelated knowledge entries, calls the LLM to generate a novel
hypothesis bridging them, scores plausibility, and stores the
result as a new pattern fact if above threshold.
- scripts/knowledge_synthesizer.py: main pipeline
- templates/synthesis-prompt.md: LLM prompt
- scripts/test_knowledge_synthesizer.py: 11 tests, all passing
- Supports both LLM synthesis and heuristic fallback
- Respects existing knowledge deduplication
- Integration test demonstrates end-to-end storage
