fix: replace print() with logger in HookRegistry

[memosr]

HookRegistry used 7 print() calls but never imported logging. This means hook lifecycle events and errors go to stdout instead of the gateway's structured log output.

Most critically, the emit() handler error at line 151 was using print() which silently discards the full traceback. A misbehaving hook that raises an unexpected exception would show only the exception message with no stack trace, making debugging nearly impossible.

Changes:

• Add import logging and module-level logger = logging.getLogger(name)
• Hook skip warnings → logger.warning()
• Hook load success → logger.info()
• Hook load error → logger.error(exc_info=True) to capture traceback
• Hook emit error → logger.exception() which always captures full traceback

What does this PR do?

Related Issue

Fixes #

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

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• I've read the Contributing Guide
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Documentation & Housekeeping

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