fix: terminal 4004 infinite reconnect loop for pi-agent tool type

- Add stdin_open: true and tty: true to dockerfile-based compose generation.
  Without these, bash (PID 1) exits immediately, causing a container restart
  loop that makes the instance invisible to docker ps and triggers 4004.
- Treat WebSocket close codes 4001/4003/4004 as permanent errors in the
  frontend. Stop retrying and show the server reason to the user.
- Prevent visibilitychange handler from resetting retry attempts after a
  permanent error has occurred.
- Use docker ps -a in get_container_id/get_container_name to find
  stopped/exited containers for diagnostics.

Quality gates: tsc --noEmit (pass), pytest (98 passed, 4 pre-existing failures)

apps/api/src/api/tool_instances.py

@@ -659,6 +659,8 @@ services:
   app:
     image: {image_tag}
     container_name: {instance_name.lower()}
+    stdin_open: true
+    tty: true
 {ports_section}    volumes:
       - {repo_path}:/workspace
     restart: unless-stopped

apps/api/src/services/docker.py

@@ -136,6 +136,8 @@ def execute_compose_command(
 def get_container_id(instance_name: str) -> str | None:
     """Get the container ID for a compose service.
 
+    Searches all containers including stopped/exited ones.
+
     Args:
         instance_name: The service name in compose
 
@@ -143,7 +145,7 @@ def get_container_id(instance_name: str) -> str | None:
         Container ID or None if not found
     """
     result = subprocess.run(
-        ["docker", "ps", "-q", "--filter", f"name={instance_name}"],
+        ["docker", "ps", "-a", "-q", "--filter", f"name={instance_name}"],
         capture_output=True,
         text=True,
     )
@@ -156,6 +158,8 @@ def get_container_id(instance_name: str) -> str | None:
 def get_container_name(instance_name: str) -> str | None:
     """Get the full container name for a compose service.
 
+    Searches all containers including stopped/exited ones.
+
     Args:
         instance_name: The service name in compose
 
@@ -163,7 +167,7 @@ def get_container_name(instance_name: str) -> str | None:
         Container name or None if not found
     """
     result = subprocess.run(
-        ["docker", "ps", "--format", "{{.Names}}", "--filter", f"name={instance_name}"],
+        ["docker", "ps", "-a", "--format", "{{.Names}}", "--filter", f"name={instance_name}"],
         capture_output=True,
         text=True,
     )