feat: build an AI agent from 0 to 1 -- 11 progressive sessions

- 11 sessions from basic agent loop to autonomous teams
- Python MVP implementations for each session
- Mental-model-first docs in en/zh/ja
- Interactive web platform with step-through visualizations
- Incremental architecture: each session adds one mechanism

web/src/data/scenarios/s10.json

@@ -0,0 +1,38 @@
+{
+  "version": "s10",
+  "title": "Team Protocols",
+  "description": "Request-response protocols for shutdown and plan approval",
+  "steps": [
+    {
+      "type": "user_message",
+      "content": "Work is done. Shut down the team gracefully.",
+      "annotation": "Can't just kill threads -- need coordinated shutdown"
+    },
+    {
+      "type": "tool_call",
+      "content": "shutdown_request(\n  teammate: \"backend-dev\",\n  request_id: \"req_abc123\"\n)",
+      "toolName": "shutdown_teammate",
+      "annotation": "request_id correlates the request with the response"
+    },
+    {
+      "type": "system_event",
+      "content": "[Shutdown FSM] req_abc123: pending\n  Lead -> backend-dev inbox:\n  { type: \"shutdown_request\", request_id: \"req_abc123\" }",
+      "annotation": "FSM tracks state: pending -> approved | rejected"
+    },
+    {
+      "type": "system_event",
+      "content": "[backend-dev] Received shutdown request req_abc123\n  Current task: none (idle)\n  Decision: approve\n  -> lead inbox: { type: \"shutdown_response\", request_id: \"req_abc123\", approve: true }",
+      "annotation": "Teammate decides whether to approve based on its own state"
+    },
+    {
+      "type": "system_event",
+      "content": "[Shutdown FSM] req_abc123: approved\n  backend-dev thread stopped\n  Status: idle -> shutdown",
+      "annotation": "Same request_id pattern works for plan approval too"
+    },
+    {
+      "type": "assistant_text",
+      "content": "backend-dev shut down gracefully. The same request_id + FSM pattern handles plan approval: teammate submits plan, lead approves/rejects with the correlated request_id.",
+      "annotation": "One pattern (request_id correlation), two applications (shutdown + plan approval)"
+    }
+  ]
+}