docs: strengthen import guidelines for AI agents

Enhance agent instruction import placement guidelines to be more explicit:
- Add "ALWAYS FOLLOW" to section heading
- Strengthen language: "MUST" instead of "should"
- Add "ALL Python files" clarification
- Emphasize "under any circumstances" for local imports

Ensures future AI agents clearly understand PEP 8 import requirements.

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

Author: dhellmann

AGENTS.md

@@ -121,10 +121,10 @@ These run automatically on commit if installed with `hatch run lint:install-hook
 
 ## Code Patterns
 
-**Import Guidelines:**
+**Import Guidelines (ALWAYS FOLLOW):**
 
-- **PEP 8: imports should be at the top**: All import statements must be placed at the top of the file, after module docstrings and before other code
-- **No local imports**: Do not place import statements inside functions, methods, or conditional blocks
+- **PEP 8: imports should be at the top**: All import statements MUST be placed at the top of the file, after module docstrings and before other code. This applies to ALL Python files in the project.
+- **No local imports**: Do not place import statements inside functions, methods, or conditional blocks under any circumstances
 
 ### Testing Pattern