chore: add pre-push prek rule to match CI behavior

Author: KRRT7

.claude/rules/code-style.md

@@ -10,3 +10,4 @@
 - **Paths**: Always use absolute paths
 - **Encoding**: Always pass `encoding="utf-8"` to `open()`, `read_text()`, `write_text()`, etc. in new or changed code — Windows defaults to `cp1252` which breaks on non-ASCII content. Don't flag pre-existing code that lacks it unless you're already modifying that line.
 - **Pre-commit**: Run `uv run prek` before committing — fix any issues before creating the commit
+- **Pre-push**: Before pushing, run `uv run prek run --from-ref origin/<base>` to check all changed files against the PR base — this matches CI behavior and catches issues that per-commit prek misses. To detect the base branch: `gh pr view --json baseRefName -q .baseRefName 2>/dev/null || echo main`