Fix hookify plugin imports missing CLAUDE_PLUGIN_ROOT fallback

[RyanAlberts]

Fixes #29842

When executing python hooks for the hookify plugin (pretooluse.py, posttooluse.py, stop.py, userpromptsubmit.py), the environment variable CLAUDE_PLUGIN_ROOT might not be present because it is only interpolated in the command string but not necessarily exported to the Python environment. This leads to Hookify import error: No module named 'core' because sys.path does not get updated correctly.

Changes Made

• Modified the 4 python hook scripts to include a reliable __file__-based fallback: PLUGIN_ROOT = os.environ.get('CLAUDE_PLUGIN_ROOT') or os.path.dirname(os.path.dirname(os.path.abspath(__file__))).
• This ensures that even if the CLAUDE_PLUGIN_ROOT environment variable is null, the script dynamically resolves the correct directory and updates sys.path, fixing the import crashes.

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