fix health check: verify dependencies.system nested keys

Caveman: health.robot test check deeper nesting for system metrics.
Docs: remove stale Task 2 (already fixed).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/tasks.md

@@ -1,19 +1,3 @@
-## Task 2: API Download - Remove Item From Queue
-
-**Suite:** `Robot.Api.Download`  
-**Test:** `Remove Item From Queue`  
-**Result:** FAIL  
-**Error:** `Url: http://127.0.0.1:8765/api/queue/item/%5B'3'%5D Expected status: 404 != 200`
-
-**Instructions:**
-- The queue item ID is being serialized as a Python list (`['3']`) in the URL, producing `%5B'3'%5D`.
-- Open `tests/robot/api/download.robot` and find the keyword that extracts the item ID from the queue response.
-- Ensure the item ID is extracted as a plain string or integer, not a list.
-- If the backend returns a list, update the test keyword to access the first element (`${item_id}[0]`).
-- Verify the corrected URL becomes `/api/queue/item/3`.
-
----
-
 ## Task 3: API Health - Detailed Health Check
 
 **Suite:** `Robot.Api.Health`  

tests/robot/api/health.robot

@@ -26,4 +26,8 @@ Detailed Health Check
     [Documentation]    Verify the detailed health endpoint returns metrics.
     ${resp}=    GET On Session    anon    /health/detailed    expected_status=200
     Response Should Have Status    ${resp}    200
-    Response Should Contain Keys    ${resp}    status    version    uptime    memory    cpu
+    Response Should Contain Keys    ${resp}    status    version    uptime    dependencies
+    ${json}=    Convert String To Json    ${resp.text}
+    Dictionary Should Contain Key    ${json["dependencies"]}    system
+    Dictionary Should Contain Key    ${json["dependencies"]["system"]}    memory_percent
+    Dictionary Should Contain Key    ${json["dependencies"]["system"]}    cpu_percent