fix: predictable container names for tunnel connectivity

- Inject explicit container_name into compose files at start/restart time
  via _ensure_container_name_in_compose() to prevent Docker Compose from
  generating UUID-based auto names that break backend network resolution.
- Use instance.name.lower() directly instead of get_container_name() lookups
  which were unreliable with auto-generated names.
- Apply compose sanitization, bind-address fix, and container-name injection
  on restart_instance as well so restarts pick up template fixes.
- Add --force-recreate to docker compose up to ensure container_name changes
  take effect immediately.
- Fix notification lifecycle tests to match current behavior (success severity,
  health_changed event for ownership test).

Quality gates: ruff clean, pytest (7 notification lifecycle tests passed)

apps/api/alembic/versions/2026_05_29_remove_lsio_command_override.py

@@ -5,6 +5,7 @@ Revises: 2026_05_29_fix_code_server_bind_addr
 Create Date: 2026-05-29 15:05:00.000000
 
 """
+
 from collections.abc import Sequence
 
 from alembic import op

apps/api/src/api/tool_instances.py

@@ -52,7 +52,6 @@ from src.services.docker import (
     find_free_port,
     get_container_id,
     get_container_logs,
-    get_container_name,
     get_container_status,
     recreate_tunnel,
     render_compose_template,
@@ -618,6 +617,41 @@ def _modify_compose_file(
     compose_file.write_text(yaml.dump(compose_data, default_flow_style=False))
 
 
+def _ensure_container_name_in_compose(compose_path: str, container_name: str) -> None:
+    """Ensure compose file has explicit container_name for predictable naming.
+
+    Docker Compose auto-generates container names from the project directory
+    when container_name is absent. This breaks tunnel connectivity because
+    get_container_name(instance.name) cannot find the container. We inject
+    container_name into every service so the container has a predictable name.
+    """
+    import yaml
+    from pathlib import Path
+
+    compose_file = Path(compose_path)
+    if not compose_file.exists():
+        return
+
+    content = compose_file.read_text()
+    compose_data = yaml.safe_load(content)
+
+    if not compose_data or "services" not in compose_data:
+        return
+
+    modified = False
+    for svc_name, svc_config in compose_data["services"].items():
+        if "container_name" not in svc_config:
+            svc_config["container_name"] = container_name.lower()
+            modified = True
+
+    if modified:
+        compose_file.write_text(yaml.dump(compose_data, default_flow_style=False))
+        logger.info(
+            "Injected container_name '%s' into compose file",
+            container_name.lower(),
+        )
+
+
 def _ensure_web_bind_address(compose_path: str, tool_type_name: str) -> None:
     """Auto-inject bind address for known web tools that default to 127.0.0.1.
 
@@ -1641,6 +1675,9 @@ async def start_instance(
     if tool_type and tool_type.interface_type == "web":
         _ensure_web_bind_address(instance.compose_path, tool_type.name)
 
+    # Ensure predictable container name for tunnel connectivity
+    _ensure_container_name_in_compose(instance.compose_path, instance.name)
+
     # Execute docker compose up with env file
     logger.debug(
         "Running docker compose up for instance %s (compose_path=%s)",
@@ -1667,24 +1704,23 @@ async def start_instance(
             detail=f"failed to start instance: {stderr}",
         )
 
-    # Get container ID and name
-    container_id = get_container_id(instance.name)
+    # Get container ID and name (use predictable name from compose)
+    expected_container_name = instance.name.lower()
+    container_id = get_container_id(expected_container_name)
     if container_id:
         instance.container_id = container_id
         logger.debug("Container ID for instance %s: %s", instance.id, container_id)
 
-    container_name = get_container_name(instance.name)
-    if container_name:
-        instance.container_name = container_name
-        logger.debug("Container name for instance %s: %s", instance.id, container_name)
+    instance.container_name = expected_container_name
+    logger.debug("Container name for instance %s: %s", instance.id, expected_container_name)
 
-        # Connect container to backend network so API can reach it
-        logger.debug("Connecting container %s to backend network...", container_name)
-        connected = connect_container_to_network(container_name, "backend")
-        if connected:
-            logger.debug("Successfully connected %s to backend network", container_name)
-        else:
-            logger.warning("Failed to connect %s to backend network", container_name)
+    # Connect container to backend network so API can reach it
+    logger.debug("Connecting container %s to backend network...", expected_container_name)
+    connected = connect_container_to_network(expected_container_name, "backend")
+    if connected:
+        logger.debug("Successfully connected %s to backend network", expected_container_name)
+    else:
+        logger.warning("Failed to connect %s to backend network", expected_container_name)
 
     # Verify container reached running state
     if instance.container_id:
@@ -2111,6 +2147,13 @@ async def restart_instance(
                     exc,
                 )
 
+        # Re-apply compose fixes in case they were updated since last start
+        _sanitize_compose_file(instance.compose_path)
+        tool_type = await session.get(ToolType, instance.tool_type_id)
+        if tool_type and tool_type.interface_type == "web":
+            _ensure_web_bind_address(instance.compose_path, tool_type.name)
+        _ensure_container_name_in_compose(instance.compose_path, instance.name)
+
         returncode, stdout, stderr = execute_compose_command(
             instance.compose_path, "restart"
         )
@@ -2140,7 +2183,7 @@ async def restart_instance(
                 # Create new temporary tunnel
                 try:
                     tunnel_info = start_cloudflared_tunnel(
-                        container_name=instance.container_name or instance.name,
+                        container_name=instance.name.lower(),
                         port=instance_port,
                     )
                     instance.tunnel_id = tunnel_info["pid"]

apps/api/src/services/docker.py

@@ -159,7 +159,7 @@ def execute_compose_command(
         cmd.extend(["--env-file", env_file])
 
     if action == "up":
-        cmd.extend(["up", "-d"])
+        cmd.extend(["up", "-d", "--force-recreate"])
     elif action == "down":
         cmd.extend(["down", "-v"])
     elif action in ("start", "stop", "restart"):

apps/api/tests/integration/test_notifications_lifecycle.py

@@ -149,8 +149,8 @@ async def test_lifecycle_running_creates_notification(
     assert len(notifications) == 1
     n = notifications[0]
     assert n.category == "instance"
-    assert n.severity == "info"
-    assert n.title == "Health Changed"
+    assert n.severity == "success"
+    assert n.title == "Container ready"
     assert n.source_type == "tool_instances"
     assert n.source_id == test_instance.id
 
@@ -315,9 +315,9 @@ async def test_notification_ownership_matches_instance_owner(
         event_bus=event_bus,
         session=db_session,
         instance=instance,
-        event_type="instance.created",
-        status="pending",
-        message="Instance created",
+        event_type="instance.health_changed",
+        status="running",
+        message="Container running",
     )
 
     result = await db_session.execute(