feat: add guidelines for Rust-Python integration to ensure consistency in class implementations

Author: kosiew

.github/copilot-instructions.md

@@ -100,3 +100,14 @@ def process_data(data: List[str], max_length: Optional[int] = None) -> List[str]
 
     return result
 ```
+
+## Rust-Python Integration
+
+**Important:** Some classes in this repository have their core implementations in Rust with Python bindings. For any changes related to these classes in Python:
+
+1. **Always update the Rust implementation first** before making corresponding changes to the Python bindings
+2. Ensure the Rust changes are properly tested in Rust before updating Python code
+3. Update Python bindings to reflect the new Rust API
+4. Add or update Python tests to cover the new functionality
+
+This ensures consistency between the Rust core and Python interface, and prevents binding mismatches.

GEMINI.md

@@ -31,6 +31,11 @@ The repository is organized as follows:
 - `pyproject.toml`: Defines the Python project metadata and dependencies.
 - `Cargo.toml`: Defines the Rust project metadata and dependencies.
 
+## Important Development Note
+
+Some classes in this repository have their core implementations in Rust.
+For any changes related to these classes in Python, ensure the corresponding updates are first made in the Rust implementation.
+
 ## How to Build and Test
 
 ### Development Setup