fix(ci): skip no-commit-to-branch in the full-suite CI run

[nstarman]

Urgent: fixes broken CI on main

no-commit-to-branch (added in ##29) is currently failing every push to main — CI checks out a real local branch literally named main for push events, so the hook (which exists to stop a human committing directly to a protected branch) fires every single time, unconditionally. This is a hotfix, not a revert: the hook stays fully active for local git commit/git push (via prek install), which is its actual purpose — it's only skipped in the "run every hook over all files" CI invocation, where it can never do anything but fail.

Test plan

• SKIP=no-commit-to-branch prek run --all-files (and prek run --skip no-commit-to-branch --all-files) verified locally to skip only this hook and run everything else normally
• prek run no-commit-to-branch --all-files (without SKIP) still fails on main / versions/* and passes on a feature branch — confirming the hook itself is untouched

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.02%. Comparing base (1430de9) to head (eed52ec).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
=======================================
  Coverage   94.02%   94.02%           
=======================================
  Files           7        7           
  Lines          67       67           
=======================================
  Hits           63       63           
  Misses          4        4           

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