fix(pre-commit): preserve matched filenames in no-underscore-md hook

[ooooo-create]

Without --, the first matched filename is treated as $0 by bash -c, which means the hook can fail without reporting every offending Markdown file.

• pass -- to bash -c in the no-underscore-md local pre-commit hook
• add an inline comment explaining why the separator is required

bash -c 'echo "Hi! $@"' "foo" "bar"
# Hi! bar

bash -c 'echo "Hi! $@"' -- "foo" "bar"
# Hi! foo bar

I found this issue in NVIDIA-NeMo/Automodel@a409ff1#diff-63a9c44a44acf85fea213a857769990937107cf072831e1a26808cfde9d096b9 , and verified the fix in the NVIDIA-NeMo/Automodel.

Because I noticed that several repositories under NVIDIA-NeMo use this hook, I came across this repository as well. I'd be happy to submit the same fix to other affected repositories too.

[Copilot]

Pull request overview

This PR fixes a subtle argument-passing bug in the template’s local no-underscore-md pre-commit hook so all matched Markdown filenames are correctly preserved and reported.

Changes:

• Pass -- to bash -c so the first matched filename isn’t consumed as $0.
• Add an inline comment documenting the bash -c argument behavior and why -- is required.

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