fix(events): ignore non-UTF-8 event overrides

[marcelsafin]

Summary

• treat non-UTF-8 integration event overrides like other unreadable override files
• retain events already resolved from earlier layers instead of aborting resolution
• add regression coverage for an invalidly encoded override

Testing

• uvx ruff@0.15.0 check src tests
• .venv/bin/pytest tests/integrations/test_events.py -q (105 passed)
• .venv/bin/pytest -q (6106 passed, 176 skipped)

AI disclosure

GitHub Copilot helped identify the missing decode-error boundary and review the implementation. I reproduced the failure and validated the final change with targeted and full test suites.

[Copilot]

Pull request overview

Handles unreadable event override files without discarding previously resolved events.

Changes:

• Catches filesystem, encoding, and YAML parsing failures.
• Adds regression coverage for a non-UTF-8 override.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/specify_cli/events.py	Ignores unreadable or malformed overrides safely.
tests/integrations/test_events.py	Verifies prior-layer events are retained.

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