Add comprehensive tests for vector/semantic search functionality

- Implement full coverage tests for Embedder model loading and embedding generation
- Add CRUD operations and caching tests for VectorStore
- Include cosine similarity computation tests
- Validate semantic search accuracy and relevance through various queries
- Establish performance benchmarks for embedding and search operations
- Ensure edge cases and error handling are covered
- Test thread safety and concurrent access scenarios
- Verify availability of semantic search dependencies

.claude/rules/project-integration.md

@@ -0,0 +1,22 @@
+# Project Integration Rules
+
+## Learning the Codebase
+
+- Find 3 similar features/components
+- Identify common patterns and conventions
+- Use same libraries/utilities when possible
+- Follow existing test patterns
+
+## Tooling
+
+- Use project's existing build system
+- Use project's test framework
+- Use project's formatter/linter settings
+- Don't introduce new tools without strong justification
+
+## Content Uniqueness Rules
+
+- **Each layer owns its abstraction level** - no content sharing between layers
+- **Reference, don't duplicate** - point to other layers, never copy content
+- **Maintain perspective** - each layer sees the system at its appropriate scale
+- **Avoid implementation creep** - higher layers stay architectural