fix s04_hooks add fault isolation to trigger_hooks

[GJZ0117]

s04_hooks: add fault isolation to trigger_hooks

Problem:
Previously, if a hook raised an exception during execution, all subsequent hooks for that event would be skipped. This created a single point of failure where one buggy hook could bypass critical security checks (e.g., permission_hook) or monitoring hooks.

Solution:
Wrap each hook execution in try-except to isolate failures:

• Continue executing remaining hooks even if one fails
• Return the first blocking result (preserving original semantics)
• Print error message with event name and failing hook function

Changes:

• Modified trigger_hooks() in s04_hooks/code.py
• Added exception handling around callback execution

This makes the hook system more robust while keeping the tutorial code simple and educational.

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