claude-code-chat-browser: YAML escape fix — handle colons, hashes, tabs, bool literals in frontmatter export #232

Job	Run time
pytest (windows-latest)	1m 13s
pytest (ubuntu-latest)	41s
Frontend unit tests (vitest) (macos-latest)	19s
API integration tests + coverage (windows-latest)	1m 2s
API integration tests + coverage (macos-latest)	18s
mypy	26s
Verify prod requirements.txt is sufficient	8s
pytest (macos-latest)	27s
API integration tests + coverage (ubuntu-latest)	16s
ruff + pip-audit (ubuntu-latest)	22s
Performance benchmarks (gated)	30s
Frontend unit tests (vitest) (ubuntu-latest)	19s
ruff + pip-audit (macos-latest)	21s
ruff + pip-audit (windows-latest)	53s
Frontend unit tests (vitest) (windows-latest)	54s
	8m 9s

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