play-faults fix: repair the malformed-reply test literal; the unroutable-model test no longer expects the model name in the fault

The previous commit (29efabe) does not build: a string literal in the new
malformed-reply test was mis-escaped.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/ghostlight-dungeon/src/play.rs

@@ -8373,7 +8373,7 @@ pub(crate) mod tests {
     /// the warn line, the card row and Debug nowhere.
     #[tokio::test]
     async fn a_malformed_local_reply_closes_the_turn_without_echoing_it() {
-        let endpoint = replying_with("\\"CANARY-reply-5d02c8\\"");
+        let endpoint = replying_with("\"CANARY-reply-5d02c8\"");
         assert_faulted_turn_names_no_endpoint(
             endpoint,
             None,

crates/ghostlight/src/sdk_inference.rs

@@ -1905,7 +1905,7 @@ mod tests {
                 .expect_err("an unroutable model inferred"),
         ] {
             assert!(fault.integrity_was_violated(), "{fault:?}");
-            assert!(fault.to_string().contains(TEST_MODEL));
+            assert!(fault.to_string().contains("no configured inference backend"), "{fault:?}");
         }
 
         // An SDK-only deployment opens with no connector binding at all, so no