fix: clients sync to server terminals instead of creating new ones

- Remove auto-creation of terminal sessions from init/selectSession/switchAgent
- Clients only connect to existing alive terminals from server registry
- Remove localStorage persistence (agent/sessionId) — state derived from server
- Refine session-state types: new AgentStatus values, LastError interface
- UI improvements: AgentBadge, ChatContainer, UserInput, BashCard updates
- Simplify claude-hook routes, update session-state service

.claude-nucleo000/settings.json

@@ -42,6 +42,29 @@
         ]
       }
     ],
+    "PostToolUseFailure": [
+      {
+        "matcher": ".*",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "powershell -NoProfile -File hooks/forward-hook.ps1 nucleo000",
+            "timeout": 5000
+          }
+        ]
+      }
+    ],
+    "SessionEnd": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "powershell -NoProfile -File hooks/forward-hook.ps1 nucleo000",
+            "timeout": 5000
+          }
+        ]
+      }
+    ],
     "SessionStart": [
       {
         "hooks": [