refactor(stack): extract _get_hooks_dir() helper

[jd]

Consolidate the duplicated hooks directory resolution logic into a
single async helper function.

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

[jd]

This pull request is part of a stack:

1. refactor(stack): extract _get_hooks_dir() helper (#934) 👈
2. refactor(stack): extract _get_script_resource_path() helper (#935)
3. refactor(stack): use as_file() for package resource copying (#937)

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    • refactor(stack): extract _get_hooks_dir() helper #934
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      • refactor(stack): extract _get_hooks_dir() helper #934
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      • refactor(stack): extract _get_hooks_dir() helper #934
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      • refactor(stack): extract _get_hooks_dir() helper #934
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      • refactor(stack): extract _get_hooks_dir() helper #934
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    • refactor(stack): extract _get_hooks_dir() helper #934
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    • refactor(stack): extract _get_hooks_dir() helper #934
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