feat: implement fuzzy search and replace functionality with Levenshtein distance

- Added `applySearchReplace` function to handle search and replace operations with fuzzy matching capabilities.
- Introduced tests for various scenarios including fuzzy matching with typos, exact matches, and handling whitespace differences.
- Created a parser for search/replace blocks to facilitate the new functionality.
- Updated prompts for search-replace operations to clarify usage and examples.
- Added utility functions for text normalization and language detection based on file extensions.
- Implemented a minimal stdio MCP server for local testing with tools for adding numbers and printing environment variables.

e2e-tests/snapshots/context_manage.spec.ts_exclude-paths-basic

@@ -46,7 +46,8 @@ You need to first add Supabase to your app and then we can add auth.
 ===
 role: user
 message: This is my codebase. <dyad-file path="manual/baz.json">
-// File contents excluded from context
+["even json is included"]
+
 </dyad-file>
 
 <dyad-file path="manual/file.ts">