fix: respect core.hooksPath git config in commit hooks

[mangodxd]

Description

When core.hooksPath is set in any git config file (system, global, or repository level), commit hooks should be resolved relative to that path instead of the default .git/hooks directory.

Currently, run_commit_hook() always uses hook_path() which hardcodes {git_dir}/hooks/{name}, ignoring the core.hooksPath setting.

Changes

In run_commit_hook(), before falling back to the default hook path via hook_path(), the function now reads core.hooksPath from the repo configuration using config_reader().get(). If the setting exists:

• Hooks are resolved relative to that path
• If the path is relative (following git's behavior), it's resolved against the working tree root
• If not set, the existing behavior is preserved unchanged

Testing

• Existing test test_run_commit_hook continues to pass
• The change is minimal (14 lines added) and non-breaking

Fixes #2083