Claude review: gpu: nova-core: gsp: add reply/no-reply info to `CommandToGsp`

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

Patch Review

This is the key design patch. It introduces:

1. A `NoReply` marker type for commands with no expected response
2. An associated `type Reply` on `CommandToGsp`
3. Splits the public API into `send_command` (waits for reply) and `send_command_no_wait` (fire-and-forget)

The type-level enforcement is well done:

```rust
+    pub(crate) fn send_command_no_wait<M>(&mut self, bar: &Bar0, command: M) -> Result
+    where
+        M: CommandToGsp<Reply = NoReply>,
```

This constrains `send_command_no_wait` to only accept commands whose `Reply` is `NoReply`, which prevents accidentally forgetting to wait for a reply.

The `send_command` method absorbs the receive loop pattern that was previously duplicated in `get_gsp_info`:

```rust
+        loop {
+            match self.receive_msg::<M::Reply>(Self::RECEIVE_TIMEOUT) {
+                Ok(reply) => break Ok(reply),
+                Err(ERANGE) => continue,
+                Err(e) => break Err(e),
+            }
+        }
```

This simplifies `get_gsp_info` to a single line, which is nice. The `SplitCommand` wrapper correctly propagates `type Reply = C::Reply`, and `ContinuationRecord` correctly uses `NoReply`.

One observation: the `wait_gsp_init_done` function still has its own manual receive loop in `commands.rs` since `GspInitDone` isn't triggered by a specific command -- it's an unsolicited notification. This is correct; it cannot use `send_command`.

The `// ` trailing comment on the import formatting (e.g., `NoReply, //`) is the `rustfmt` skip trick to force vertical formatting -- standard practice in the kernel Rust code.

No issues.

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