Add proper lifecycle and superseding support for Architectural Decision Records

server/src/tools.rs

@@ -220,6 +220,8 @@ pub struct LogDecisionTool {
     pub decision: String,
     /// The consequence of the decision.
     pub consequence: String,
+    /// The ID of an older ADR this decision supersedes, if any.
+    pub supersedes: Option<String>,
 }
 
 /// Query architectural decision records.