fix(small crates): the proof lint now covers every first-party crate but one

Six crates were still unguarded, and all six are OURS — none vendored: pf-console-ui, pf-gpu,
punktfunk-tray, clients/windows, tools/display-disturb, wdk-probe. Two of them ship (the tray and
the Windows client), so "small" was about item count, not exposure.

Five are closed here. Only 17 of their 75 unsafe items actually lacked a proof — pf-gpu,
punktfunk-tray and display-disturb were already fully documented and needed nothing but the deny,
which is the good case: the convention was being followed, just not enforced.

The 17 that were missing are the usual Win32/COM shapes, and two were worth stating properly.
`clients/windows`'s `GetCurrentPackageFullName` is called with `len = 0` and no buffer — that is the
documented identity PROBE, which writes nothing, and reading it as a normal query would be a
mistake. `pf-console-ui`'s two `destroy_image_view` calls are the load-bearing ones: the comment
above one already argued that in-flight sampling of that slot ended two presents ago (the ring
alternates and the presenter waits its fence before each record), which is exactly the kind of
reasoning a `// SAFETY:` should carry and it was sitting there unlabelled.

Also fixes a real Windows-only clippy error this uncovered: `pf-gpu` had a
`#[cfg(target_os = "windows")]` fn AFTER its `mod tests`, tripping `items_after_test_module`. It
never fired on Linux (the item does not exist there) and no CI job clippies pf-gpu on Windows, so it
sat unseen. Moved above the test module.

Remaining: `wdk-probe` (26 items) alone, and only because it needs the WDK to build — .47 cannot,
so nothing here can verify a deny on it.

Verified: Linux .21 fmt + both CI clippy steps rc=0; Windows .47 the four Windows-relevant crates at
`-D warnings` rc=0.

clients/windows/src/shell_window.rs

@@ -18,6 +18,9 @@ use windows::Win32::UI::WindowsAndMessaging::{
 static SHELL_HWND: AtomicIsize = AtomicIsize::new(0);
 
 fn shell_hwnd() -> Option<HWND> {
+    // SAFETY: the cached value is an `HWND` this process obtained itself; it is re-validated with
+    // `IsWindow` before use (a stale handle is treated as absent), and the lookup calls take only
+    // static wide literals.
     unsafe {
         let cached = SHELL_HWND.load(Ordering::Relaxed);
         if cached != 0 {
@@ -37,6 +40,8 @@ fn shell_hwnd() -> Option<HWND> {
 /// the shell in view with its error banner).
 pub(crate) fn hide() {
     if let Some(h) = shell_hwnd() {
+        // SAFETY: `h` is the validated shell window handle from `shell_hwnd`; `ShowWindow` takes it
+        // plus a plain flag and dereferences nothing.
         unsafe {
             let _ = ShowWindow(h, SW_HIDE);
         }
@@ -47,6 +52,8 @@ pub(crate) fn hide() {
 /// it was never hidden — showing a visible window is a no-op.
 pub(crate) fn restore() {
     if let Some(h) = shell_hwnd() {
+        // SAFETY: as `hide` — `h` is the validated shell window handle, and both calls take only
+        // that handle plus a plain flag.
         unsafe {
             let _ = ShowWindow(h, SW_SHOW);
             let _ = SetForegroundWindow(h);
@@ -60,6 +67,7 @@ pub(crate) fn restore() {
 pub(crate) fn position() -> Option<(i32, i32)> {
     let h = shell_hwnd()?;
     let mut r = RECT::default();
+    // SAFETY: `h` is the validated shell window handle and `r` is a live local the call fills.
     unsafe { GetWindowRect(h, &mut r).ok()? };
     Some((r.left, r.top))
 }