Claude review: gpu: nova-core: gsp: add `RECEIVE_TIMEOUT` constant for command queue

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

Patch Review

Extracts the magic `Delta::from_secs(10)` and `Delta::from_secs(5)` values into a single `RECEIVE_TIMEOUT` constant.

One note: the `get_gsp_info` caller previously used a 5-second timeout (`Delta::from_secs(5)`) while the others used 10 seconds:

```rust
-        match cmdq.receive_msg::<GetGspStaticInfoReply>(Delta::from_secs(5)) {
+        match cmdq.receive_msg::<GetGspStaticInfoReply>(Cmdq::RECEIVE_TIMEOUT) {
```

This silently increases the timeout for `get_gsp_info` from 5s to 10s. This is almost certainly fine (a 5s timeout was probably just picked arbitrarily, and 10s is more conservative), but it should be mentioned in the commit message since it's a behavioral change, not just a mechanical refactor.

The visibility `pub(super)` is appropriate.

---
Generated by Claude Code Patch Reviewer