ci: pre-commit check-yaml fails on mkdocs.yml python-specific tag

[db-tycoon-stephen]

Found while building PR #153: uvx pre-commit run --all-files fails on the check-yaml hook because mkdocs.yml uses the mkdocs-material tag !!python/name:material.extensions.emoji.twemoji, which yaml.safe_load rejects. Pre-existing (reproduces on a clean tree) — invisible until now because pre-commit wasn't run with --all-files; the new gitleaks/bandit hooks (PR #153) make full runs more likely.

Fix options: args: [--unsafe] on the check-yaml hook (syntax-only check), or exclude: ^mkdocs\.yml$.

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