fix: apply isort formatting to fix CI linting

Applied isort to properly sort all imports according to PEP8:
- Standard library imports first
- Third-party imports second
- Local imports last
- Alphabetical ordering within each group

All tests still passing after import reordering.

prompts/__init__.py

@@ -2,12 +2,8 @@
 System prompts for Gemini tools
 """
 
-from .tool_prompts import (
-    THINK_DEEPER_PROMPT,
-    REVIEW_CODE_PROMPT,
-    DEBUG_ISSUE_PROMPT,
-    ANALYZE_PROMPT,
-)
+from .tool_prompts import (ANALYZE_PROMPT, DEBUG_ISSUE_PROMPT,
+                           REVIEW_CODE_PROMPT, THINK_DEEPER_PROMPT)
 
 __all__ = [
     "THINK_DEEPER_PROMPT",