Add delete_decision tool for removing redundant ADRs

server/src/tools.rs

@@ -233,6 +233,13 @@ pub struct QueryDecisionsTool {
     pub include_body: Option<bool>,
 }
 
+/// Delete an architectural decision record (ADR).
+#[derive(Debug, Deserialize, Serialize, JsonSchema)]
+pub struct DeleteDecisionTool {
+    /// The ID of the decision to delete.
+    pub id: String,
+}
+
 /// Merge two entities in the knowledge graph into one.
 #[derive(Debug, Deserialize, Serialize, JsonSchema)]
 pub struct MergeEntitiesTool {