Restore Rust formatting compliance

Run rustfmt from the Rust workspace so CI format checks pass without changing behavior.

Constraint: Scope is formatting-only across tracked Rust files

Confidence: high

Scope-risk: narrow

Tested: cd rust && cargo fmt --check

Tested: git diff --check

rust/crates/rusty-claude-cli/tests/compact_output.rs

@@ -172,7 +172,10 @@ stderr:
     );
     let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
     let parsed: Value = serde_json::from_str(&stdout).expect("compact json stdout should parse");
-    assert_eq!(parsed["message"], "Mock streaming says hello from the parity harness.");
+    assert_eq!(
+        parsed["message"],
+        "Mock streaming says hello from the parity harness."
+    );
     assert_eq!(parsed["compact"], true);
     assert_eq!(parsed["model"], "claude-sonnet-4-6");
     assert!(parsed["usage"].is_object());