fix(simulation): correct crate name in log10_floor doctest

The doctest imported `server::bps::log10_floor`, but the library crate is
`settled_reach_server` — so `cargo test --doc` failed to compile the
example (unresolved module `server`). Broken since the helper landed in
#145; it only surfaces under `--doc`, not `--lib`, so the pre-push gate
(which runs `--lib`) never caught it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/src/bps.rs

@@ -24,7 +24,7 @@
 /// # Examples
 ///
 /// ```
-/// use server::bps::log10_floor;
+/// use settled_reach_server::bps::log10_floor;
 /// assert_eq!(log10_floor(1), 0);
 /// assert_eq!(log10_floor(9), 0);
 /// assert_eq!(log10_floor(10), 1);