Trim whitespace and include generated commit messages in rule

[schuslalom]

Description

1. Updates the commit conventions rule (007-commit-conventions.mdc) to explicitly include generated commit messages, ensuring consistent message formatting across both manual and AI-generated commits.
2. Enhances the clean code standards (005-clean-code.mdc) by adding a requirement to trim trailing and leading whitespace from all files before saving changes, promoting cleaner and more consistent code.

Changes

• Modified the description in 007-commit-conventions.mdc to include "OR generating commit messages" in its scope
• Added a new clean code requirement in 005-clean-code.mdc for whitespace trimming