Jason Woltje 3969dd5598 feat(#70): implement semantic search API with Ollama embeddings ...

Updated semantic search to use OllamaEmbeddingService instead of OpenAI:
- Replaced EmbeddingService with OllamaEmbeddingService in SearchService
- Added configurable similarity threshold (SEMANTIC_SEARCH_SIMILARITY_THRESHOLD)
- Updated both semanticSearch() and hybridSearch() methods
- Added comprehensive tests for semantic search functionality
- Updated controller documentation to reflect Ollama requirement
- All tests passing with 85%+ coverage

Related changes:
- Updated knowledge.service.versions.spec.ts to include OllamaEmbeddingService
- Added similarity threshold environment variable to .env.example

Fixes #70

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-02 15:15:04 -06:00

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