feat(agent): align the document tools with the harness-trained shape — ls, read(path), grep(pattern, path?)

tests/integration/test_chats_api.py

@@ -64,8 +64,12 @@ FULL_BRAIN: dict[str, Any] = {
     "suggestions": ["What ports does Traefik expose?"],
     "thinking": "The kubernetes doc covers the cluster layout…",
     "tools": [
-        {"name": "read_document", "argument": "Homelab/kubernetes.md"},
-        {"name": "list_documents", "argument": None},
+        {"name": "read", "argument": "Homelab/kubernetes.md"},
+        {"name": "ls", "argument": None},
+        # Saved chats persisting the pre-phase-70 tool names still
+        # validate — ``name`` is opaque to the API (no migration,
+        # locked: old chats render fine).
+        {"name": "read_document", "argument": "Homelab/legacy-notes.md"},
     ],
     "stopped": False,
 }