Write log files with utf-8 encoding

[soimkim]

Windows FileHandler defaulted to cp949 and failed on non-cp949 characters in debug logs. Open log files as UTF-8 instead.

[coderabbitai]

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 225c447 and 8d92c62.

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• src/fosslight_util/set_log.py

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📝 Walkthrough

Walkthrough

The logging setup now uses explicit UTF-8 encoding for the initial, relocated, and fallback log file handlers.

Changes

Logging Encoding

Layer / File(s)	Summary
Set UTF-8 encoding for log handlers src/fosslight_util/set_log.py	The initial, relocated, and fallback FileHandler instances now use encoding="utf-8".

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 8d92c

This localized change updates log-file encoding behavior to support UTF-8, with no actionable merge-blocking risk remaining beyond normal checks and review.

Suggested reviewers: bjk7119

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: writing log files with UTF-8 encoding.

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