Claude review: gpu: nova-core: refactor SEC2 booter loading into BooterFirmware::run()

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

Patch Review

Clean refactoring by John Hubbard. The SEC2 reset/load/boot/check sequence moves into `BooterFirmware::run()`:

```rust
+pub(crate) fn run<T>(
+    &self,
+    dev: &device::Device<device::Bound>,
+    bar: &Bar0,
+    sec2_falcon: &Falcon<Sec2>,
+    wpr_meta: &Coherent<T>,
+) -> Result {
```

The generic `<T>` for `wpr_meta` is appropriate since `run()` only needs the DMA handle from the `Coherent`, not the inner type.

The thin `run_booter()` wrapper in boot.rs creates the firmware and immediately calls `run()`, keeping the boot flow readable. No issues.

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