feat(video): DashScope video specialist with correct i2v request bodies

- Add video_generation_client: async video-synthesis, t2v vs i2v (Wan 2.7 input.media first_frame vs legacy img_url).

- Coerce *-t2v* to *-i2v* when first frame present; AIA_VIDEO_I2V_INPUT_STYLE / I2V_MODEL overrides.

- Gateway/direct_loop early return for video specialist; workspace video + factory allowlist.

- Normalize WS and admin chat attachments (image_ref parity); mp4 attachment store roundtrip tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/agents/factory.py

@@ -276,7 +276,7 @@ def build_ops_agent(
 
 
 # `default_registry` treats empty allow_tags + empty allow_tools as "no filter". Use an impossible
-# tool name so the image specialist gets an empty tool surface (vision-only turns).
+# tool name so image/video specialists get an empty tool surface (dedicated HTTP lanes).
 _IMAGE_SPECIALIST_TOOL_ALLOWLIST: tuple[str, ...] = ("__oclaw_image_specialist_no_tools__",)
 
 
@@ -334,7 +334,7 @@ def build_gateway_executor(
         "path_policy_user_id": path_policy_user_id,
         "store": store,
     }
-    if prof.name == "image":
+    if prof.name in {"image", "video"}:
         reg_kw["allow_tools"] = list(_IMAGE_SPECIALIST_TOOL_ALLOWLIST)
     tools = default_registry(**reg_kw)
     return Agent(