feat(mcp): add memory_session_context tool for opencode session recall

mcp-wrapper/src/tools.ts

@@ -24,6 +24,7 @@ export const TOOL_NAMES = [
   "memory_contradict",
   "memory_capture",
   "memory_consolidate",
+  "memory_session_context",
   "profile_get_set",
   "curiosity_pending",
   "schema_list",
@@ -185,6 +186,18 @@ export const toolSchemas: Record<ToolName, ToolSchema> = {
       },
     },
   },
+  memory_session_context: {
+    name: "memory_session_context",
+    description:
+      "Retrieve the current session context payload (identity, session handle, " +
+      "topic cluster, rich club). Call at session start to load relevant " +
+      "background memory. Returns JSON with l0, l1, l2, rich_club, and " +
+      "compact_handle fields.",
+    inputSchema: {
+      type: "object",
+      properties: {},
+    },
+  },
   profile_get_set: {
     name: "profile_get_set",
     description:
@@ -348,6 +361,8 @@ export async function invokeTool(
       return bridge.call("memory_capture", args);
     case "memory_consolidate":
       return bridge.call("memory_consolidate", args);
+    case "memory_session_context":
+      return bridge.call("session_start_payload", {});
     case "profile_get_set": {
       const op = args.operation as string;
       if (op === "get") {