🚸 Rename commit message extension from .toml to .pijul-commit

This prevents smart editors from messing up the commit file format on save and also allows custom tree-sitter syntax highlight based on file extension.

Created by  berkus  on June 24, 2025
RP2E25N5LOIXVRI4HZ6ZUKNAYHPCB63AXGL25NQ74CV6YDCSF27QC
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