chore: add lefthook

[bytaesu]

No description provided.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[greptile-apps]

Greptile Summary

Adds Lefthook-based pre-commit automation.

• Installs Lefthook during package preparation when running inside a Git repository.
• Runs Biome and frozen-lockfile checks before commits.
• Adds the Lefthook dependency and corresponding pnpm configuration.
• Reformats the password key-generation signature without changing behavior.

Confidence Score: 5/5

The PR appears safe to merge.

The revised prepare script no longer masks Lefthook installation failures, and no blocking failure remains.

_{Reviews (3): Last reviewed commit: "Merge branch 'main' into chore/add-lefth..." | Re-trigger Greptile}