Update the .improv file grammar to require version v2025-04-09 and remove
unnecessary blank line requirements at the start of files. Update
bank-info.improv to comply with the new version and reformat date entries
and categories.
BREAKING CHANGE: The .improv grammar now strictly requires the version line 'v2025-04-09'.
Existing files without this line will fail to parse.
Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-31B-it-UD-Q4_K_XL.gguf)
