feat: Implement Claude-mem MCP Search Server with session and observation search capabilities

- Added search functionality for observations and sessions using full-text search.
- Implemented formatting functions for search results with citations.
- Created multiple tools for searching by various criteria including concept, file, type, and advanced search.
- Integrated structured filters and pagination options for search queries.
- Established error handling for search operations and server initialization.

src/sdk/worker.ts

@@ -1,4 +1,4 @@
-#!/usr/bin/env bun
+#!/usr/bin/env node
 /**
  * SDK Worker Process
  * Background server that processes tool observations via Unix socket