chore(dev): disable pre-push hook

[jeanduplessis]

Summary

Disable repository pre-push enforcement so developers can push branches without waiting for local validation.

Why this change is needed

Cloud agent started timing out due to the compute requirements for running all the pre-push checks. Team decided validation should not block every local push. GitHub Actions already enforces formatting, lint, and full workspace typechecking for pull requests targeting main.

How this is addressed

• Remove tracked Husky pre-push hook.
• Remove stale development documentation describing automatic pre-push validation.

Human Verification

• Confirmed Husky dispatcher exits successfully when tracked .husky/pre-push file is absent.
• Confirmed .github/workflows/ci.yml still runs formatting, lint, and full workspace typechecking for pull requests targeting main.

Reviewer Notes

Human Reviewer Flags

• Removing hook also removes automatic git lfs pre-push execution. Contributors pushing .mp4 or .webm assets must run Git LFS upload explicitly.