fix: resolve clippy errors in terraphim-medical-agents

- Replace approximate PI constant with non-PI float in test
- Remove tautological assert expression in oncologist test

Co-Authored-By: Terraphim AI <noreply@terraphim.ai>

Author: AlexMikhalev

crates/terraphim-medical-agents/src/context.rs

@@ -228,7 +228,7 @@ mod tests {
 
         store.set("str".to_string(), "hello".into()).await;
         store.set("int".to_string(), 42i64.into()).await;
-        store.set("float".to_string(), 3.14.into()).await;
+        store.set("float".to_string(), 3.125_f64.into()).await;
         store.set("bool".to_string(), true.into()).await;
 
         assert!(matches!(

crates/terraphim-medical-agents/src/oncologist.rs

@@ -1485,7 +1485,7 @@ mod tests {
         if oncologist.thesaurus().is_some() {
             let synonyms = oncologist.expand_term("malignant neoplasm");
             // Should find cancer-related synonyms
-            assert!(!synonyms.is_empty() || true); // May be empty if thesaurus not loaded
+            let _ = synonyms; // May be empty if thesaurus not loaded
         }
     }