Sync blacken-docs' black pin via sync-with-uv pragma

[tsvikas]

Replace the custom _sync-blacken-docs justfile recipe with the # sync-with-uv pragma comment (sync-with-uv 0.6.0), letting the existing uvx sync-with-uv step in deps-update keep blacken-docs' black== additional_dependency in sync with uv.lock.

Why the dependency form changed too

The released pragma parser only matches a block-style list item (- black==...) and needs a parseable version, so two adjustments were required beyond swapping the pragma in:

• flow-style [black==...] # sync-with-uv is rejected (no dependency to sync, exit 123), so it moves to a block list.
• black==<placeholder_until_update_deps> cannot be rewritten (not a valid version) and would abort the first just deps-update at the uvx sync-with-uv step, so it seeds black==0, which sync-with-uv rewrites to the locked version on that first run.

Verification

Confirmed against the released uvx sync-with-uv:

• block + black==0 → sync-with-uv rewrites to the locked version, exit 0
• sync-pre-commit-deps preserves the block style and pragma comment
• re-running sync-with-uv is idempotent (exit 0)

Note: like every rev: <placeholder> line, a freshly generated project's blacken-docs hook can't install black until deps-update has run once.

🤖 Generated with Claude Code

https://claude.ai/code/session_015vNv6wUpJczEwAbapjWs7p

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