pre-commit-checks.sh hook fails on Windows (beforeShellExecution)

## Summary

The Cursor plugin's `beforeShellExecution` hook runs `./scripts/pre-commit-checks.sh` on `git commit`, but this does not work reliably on Windows.

## Environment

- OS: Windows 10/11
- Editor: Cursor
- Plugin: Convex Cursor plugin (`hooks.json` → `beforeShellExecution`)
- Hook command: `./scripts/pre-commit-checks.sh`

## Problem

`hooks.json` invokes a Bash script directly:

```json
{
"command": "./scripts/pre-commit-checks.sh",
"matcher": "\\bgit\\s+commit\\b"
}
```

On Windows, Cursor does not appear to execute `.sh` files via a Bash interpreter automatically. The hook fails to run when the agent (or IDE) runs `git commit`.

## Expected behavior

Pre-commit Convex checks should run cross-platform when `git commit` is executed from Cursor on Windows, same as on macOS/Linux.

## Actual behavior

Windows prompts to open the .sh file (or opens it in the configured editor if any).

Start with hooks.json and scripts/pre-commit-checks.sh, then inspect how the Cursor beforeShellExecution hook invokes the script for git commit. Reproduce the failure in Cursor on Windows and verify that the Convex pre-commit checks execute there without breaking the existing macOS/Linux behavior.

Written by the indexing model from the issue text.