[bugfix] Write generated documentation as UTF-8

[shahradzomorrodi]

Purpose

Make generated example documentation build reliably on Windows. Before this change, python docs/generate_examples.py could fail with UnicodeEncodeError when Python selected the system cp1252 encoding and an example contained Unicode.

Changes

• Write all generated Markdown files with explicit UTF-8 encoding.
• Keep source reads and generated writes on the same encoding without changing content on UTF-8-default systems.

Test Plan

python docs/generate_examples.py
python scripts/check_docs_links.py
python -m py_compile docs/generate_examples.py
pre-commit run --files docs/generate_examples.py
python -m mkdocs build

Test Results

Test output

Generating example documentation...
Example documentation generated successfully!
Docs link check passed.
MkDocs build passed.
yapf, ruff, codespell, mypy, and repository filename checks passed.

Checklist

• I ran pre-commit run --all-files and fixed all issues
• I added or updated tests for my changes
• I updated documentation if needed
• I considered GPU memory impact of my changes

For model/pipeline changes, also check:

• I verified SSIM regression tests pass
• I updated the support matrix if adding a new model

[github-actions]

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[mergify]

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	Protection	Waiting on
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• #approved-reviews-by>=1
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• #approved-reviews-by>=1
• check-success=full-suite-passed
• check-success=fastcheck-passed
• check-success~=pre-commit
• title~=(?i)^\[(feat|feature|bugfix|fix|refactor|perf|ci|doc|docs|misc|chore|kernel|new.?model|skill|skills|infra)\]