**What happened**
A `theme-set.d` hook script written in Python (`#!/usr/bin/env python3` shebang, executable via `chmod +x`) fails every time a theme is applied. The errors are bash trying to parse Python syntax as shell commands — e.g. `import sys` resolves to ImageMagick's `import` binary and fails with "unable to grab mouse", `from pathlib import Path` fails with "from: command not found", and the script dies on the first real assignment with a syntax error.

**Root cause**
`/usr/share/omarchy/bin/omarchy-hook` invokes every file in `<hook>.d/` unconditionally with `bash "$hook" "$@"`, regardless of the file's shebang or executable bit:

```bash
if [[ -d $HOOK_DIR ]]; then
  for hook in "$HOOK_DIR"/*; do
    [[ -f $hook ]] || continue
    [[ $hook == *.sample ]] && continue
    bash "$hook" "$@" || echo "Hook failed: $hook"
  done
fi
```

This silently discards the shebang, so any hook not written in bash (Python, in this case) is unusable even though it's installed exactly as `hooks.md` describes (executable, in the right `.d` directory).

**Expected**
An executable hook script with a valid shebang should be invoked directly (`"$hook" "$@"`), letting the kernel/shebang pick the interpreter — falling back to `bash "$hook"` only for non-executable files, matching how `omarchy hook install` already makes scripts executable.

**Steps to reproduce**
1. Create `~/.config/omarchy/hooks/theme-set.d/test-hook.py`:
   ```python
   #!/usr/bin/env python3
   print("hello from python")
   ```
2. `chmod +x ~/.config/omarchy/hooks/theme-set.d/test-hook.py`
3. `omarchy theme set <any-theme>` or `omarchy-hook theme-set <slug>`
4. Observe bash errors instead of `hello from python`.

This is not theme-specific — it reproduces on every theme switch, for any theme, since the runner never inspects the theme at all before dispatching the hook.

**System**
- Omarchy version: 4.0.2-1 (stable channel)
- Kernel: Linux 7.1.9-arch1-2 x86_64
- GPU: NVIDIA GeForce RTX 3060 (GA106)

**Note:** `omarchy debug --no-sudo --print` from the current docs doesn't exist on this installed version (`omarchy commands --all` has no `debug` group), so I couldn't attach the standard diagnostic log — worth checking if that command was renamed/removed since 4.0.2-1.