fix: v0.5.1 — pull_image API (Image/pull_start, not Registry/pull_start)

The 0.5.0 prompt mis-attributed the API: pull_start lives on
SYNO.Docker.Image, not SYNO.Docker.Registry (live DSM capture).
search and tags ARE correctly on Registry; only pull_start belongs
to Image. Registry/pull_start returns "Method does not exist".

Parameters are unchanged (repository + tag both JSON-encoded), and
the Image/list polling for completion detection is untouched.

Tests updated to assert SYNO.Docker.Image/pull_start. CLAUDE.md
DSM-quirks section consolidates the Image vs. Registry split so
this trap is documented for future surface additions. References
#3 (already closed).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_modules/test_registry.py

@@ -279,7 +279,7 @@ async def test_pull_image_already_present():
     result = await tools["pull_image"](repository="nginx", tag="1.24", confirmed=True)
     assert "already present" in result
 
-    # Only the Image/list pre-check was called; pull_start must NOT fire.
+    # Only the Image/list pre-check was called; no pull_start of any kind.
     calls = client.request.call_args_list
     assert all(c.args[1] != "pull_start" for c in calls)
 
@@ -307,7 +307,7 @@ async def test_pull_image_confirmed_success(monkeypatch):
                     ]
                 }
             return {"images": []}
-        if api == "SYNO.Docker.Registry" and method == "pull_start":
+        if api == "SYNO.Docker.Image" and method == "pull_start":
             state["pulled"] = True
             return {}
         raise AssertionError(f"Unexpected call: {api}/{method}")
@@ -322,9 +322,11 @@ async def test_pull_image_confirmed_success(monkeypatch):
     assert "Pulled" in result
     assert "nginx:1.24" in result
 
-    # Verify pull_start was invoked with JSON-encoded params
+    # Verify pull_start was invoked on SYNO.Docker.Image (not Registry)
+    # with JSON-encoded params.
     pull_calls = [c for c in client.request.call_args_list if c.args[1] == "pull_start"]
     assert len(pull_calls) == 1
+    assert pull_calls[0].args[0] == "SYNO.Docker.Image"
     params = pull_calls[0].kwargs.get("params", {})
     assert json.loads(params["repository"]) == "nginx"
     assert json.loads(params["tag"]) == "1.24"
@@ -348,7 +350,7 @@ async def test_pull_image_timeout(monkeypatch):
     async def mock_request(api, method, **kwargs):
         if api == "SYNO.Docker.Image" and method == "list":
             return {"images": []}
-        if api == "SYNO.Docker.Registry" and method == "pull_start":
+        if api == "SYNO.Docker.Image" and method == "pull_start":
             return {}
         raise AssertionError(f"Unexpected call: {api}/{method}")
 
@@ -371,7 +373,7 @@ async def test_pull_image_start_error():
     async def mock_request(api, method, **kwargs):
         if api == "SYNO.Docker.Image" and method == "list":
             return {"images": []}
-        if api == "SYNO.Docker.Registry" and method == "pull_start":
+        if api == "SYNO.Docker.Image" and method == "pull_start":
             raise SynologyError("Permission denied", code=105)
         raise AssertionError(f"Unexpected call: {api}/{method}")