test: improve test coverage from 65% to 99%

[GeiserX]

Summary

• Add 19 targeted tests covering all previously untested code paths in lint.py
• Coverage improvement: 65% -> 99% (only the if __name__ guard line remains uncovered)
• No production code changes

Tests added

• Lint disable/enable block handling and ToC entry collection
• ToC vs section mismatch detection
• Subsection (###) alphabetical order reset
• Unparseable entry error reporting
• Description validation: missing description, starts with project name
• Custom tag badge requirement (missing, clickable present, plain present)
• main() function: file not found, clean exit, error output, all env var overrides (INPUT_ALLOWED_HOSTS, INPUT_REQUIRE_BADGES, INPUT_BADGE_TYPES, INPUT_REQUIRE_CUSTOM_TAGS, INPUT_CHECK_ALPHABETICAL), line-0 error formatting

Test plan

• All 48 tests pass (python3 -m pytest --cov=lint --cov-report=term-missing)
• Coverage: 99% (152 stmts, 1 miss — line 253 if __name__)
• No production code modified

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 2bee5a74-0556-4328-846e-78cca01ee0b4

📥 Commits

Reviewing files that changed from the base of the PR and between 51aec1e and 2bfea26.

📒 Files selected for processing (1)

• tests/test_lint.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/improve-coverage

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