⬆️ Replace pre-commit with prek for hook management

[tsvikas]

Summary

• Swap pre-commit for prek, a Rust-based drop-in replacement, in dev deps and all just recipes.
• Use the canonical prek auto-update (hyphenated) command name; the old autoupdate alias still works but new flags (--cooldown-days, --check) are documented only on the hyphenated form.
• Replace pre-commit/action with j178/prek-action@v2 (SHA-pinned) in CI.
• Drop the -j flag and the appears to be a mutable reference grep filter from deps-update: prek defaults --jobs to 0 (auto-detect cpu count) and does not emit the pre-commit-only warning the filter targeted.

Test plan

• just deps-update succeeds and updates the rendered .pre-commit-config.yaml
• just lint passes locally with prek run --all-files
• CI prek job runs prek run --all-files and passes
• Initialize a fresh project from the template with just init and confirm prek install --install-hooks runs

🤖 Generated with Claude Code

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