feat(server): refactor handlers, router, state management, and memory tools

server/src/tools.rs

@@ -700,3 +700,28 @@ pub struct SemanticCodeSearchTool {
 pub struct ReadDirectoryArchitectureTool {
     pub directory: String,
 }
+
+/// Create a point-in-time state snapshot of memory stores for safety.
+#[derive(Debug, Deserialize, Serialize, JsonSchema)]
+pub struct CreateSnapshotTool {
+    pub description: String,
+    pub namespace: Option<String>,
+}
+
+/// Restore a point-in-time state snapshot of memory stores.
+#[derive(Debug, Deserialize, Serialize, JsonSchema)]
+pub struct RestoreSnapshotTool {
+    pub snapshot_id: String,
+}
+
+/// Create an isolated memory namespace for a subagent session.
+#[derive(Debug, Deserialize, Serialize, JsonSchema)]
+pub struct CreateSubagentNamespaceTool {
+    pub subagent_id: String,
+}
+
+/// Purge an isolated subagent memory namespace after session completion.
+#[derive(Debug, Deserialize, Serialize, JsonSchema)]
+pub struct PurgeSubagentNamespaceTool {
+    pub subagent_id: String,
+}