Claude review: rust: pci: make Bar lifetime-parameterized

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Key conversion of `Bar<SIZE>` to `Bar<'a, SIZE>`:

```rust
-pub struct Bar<const SIZE: usize = 0> {
-    pdev: ARef<Device>,
+pub struct Bar<'a, const SIZE: usize = 0> {
+    pdev: &'a Device<device::Bound>,
```

`iomap_region_sized()` changes from returning `impl PinInit<Devres<Bar<SIZE>>, Error>` to returning `Result<Bar<'a, SIZE>>` directly. The `into_devres()` method is added:

```rust
+    pub fn into_devres(self) -> Result<Devres<Bar<'static, SIZE>>> {
+        let bar: Bar<'static, SIZE> = unsafe { core::mem::transmute(self) };
+        let pdev = bar.pdev;
+        Devres::new(pdev.as_ref(), bar)
+    }
```

The transmute is sound because Devres guarantees the Bar doesn't actually outlive the device -- access is revoked on unbind. The SAFETY comment is adequate.

Note: After `transmute`, the code reads `bar.pdev` to get the device reference for `Devres::new`. This is safe because `pdev` was valid before transmute and the `'static` typing doesn't affect the pointer value, but the reference to `bar.pdev` is taken after `bar` has been transmuted to `'static`, which is fine since the device itself outlives this scope.

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