refactor: rename review tools for clarity and consistency

- Renamed `review_code` tool to `codereview` for better naming convention
- Renamed `review_changes` tool to `precommit` to better reflect its purpose
- Updated all tool descriptions to remove "Triggers:" sections and improve clarity
- Updated all imports and references throughout the codebase
- Renamed test files to match new tool names
- Updated server.py tool registrations
- All existing functionality preserved with improved naming

This refactoring improves code organization and makes tool purposes clearer.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

prompts/__init__.py

@@ -5,14 +5,14 @@ System prompts for Gemini tools
 from .tool_prompts import (
     ANALYZE_PROMPT,
     CHAT_PROMPT,
+    CODEREVIEW_PROMPT,
     DEBUG_ISSUE_PROMPT,
-    REVIEW_CODE_PROMPT,
     THINK_DEEPER_PROMPT,
 )
 
 __all__ = [
     "THINK_DEEPER_PROMPT",
-    "REVIEW_CODE_PROMPT",
+    "CODEREVIEW_PROMPT",
     "DEBUG_ISSUE_PROMPT",
     "ANALYZE_PROMPT",
     "CHAT_PROMPT",