[BUG] Missing Claude provider in message generation switch.

[DFanso]

The commit message generation logic checks for "google" and "chatgpt" but defaults to grok for all other cases, including "claude". The Claude provider is never actually invoked.

https://github.com/DFanso/commit-msg/pull/19#discussion_r2401744564

[DFanso]

in main.go

[adeeshperera]

Hey @DFanso
Can you please assign this issue to me?

[DFanso]

sure @adeeshperera