feat(lists): expose emoji + color in get_lists + create_list (v0.5.1)

get_lists now includes emoji and color fields per list entry.
create_list response also returns emoji and color from the API.

Field name verification (FW_DEBUG=1, 2026-04-16):
- emoji: API returns "" when unset -> normalised to null
- color: API omits key when unset -> normalised to null
- Both fields present in taskgettasklists and taskcreatelist responses

SPEC.md: taskgettasklists documented with full response structure
         and emoji/color normalisation notes.
         taskcreatelist response updated with emoji + color fields.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp_familywall/server.py

@@ -284,6 +284,9 @@ def get_lists(scope: str | None = None):
     result = []
     for item in raw_lists:
         # TODO: apply scope filtering once the circle field is identified.
+        # emoji: API returns "" when unset — normalise to None for a clean JSON null.
+        # color: API omits the key entirely when unset — .get() returns None directly.
+        raw_emoji: str = item.get("emoji", "")
         result.append(
             {
                 "id": item.get("metaId"),
@@ -291,6 +294,8 @@ def get_lists(scope: str | None = None):
                 "type": item.get("taskListType"),
                 "open": item.get("remainingTaskNumber"),
                 "total": item.get("totalTaskNumber"),
+                "emoji": raw_emoji if raw_emoji else None,
+                "color": item.get("color") or None,
             }
         )
 
@@ -927,6 +932,7 @@ def create_list(
             indent=2,
         )
 
+    raw_emoji: str = list_obj.get("emoji", "")
     return json.dumps(
         {
             "created": True,
@@ -934,6 +940,8 @@ def create_list(
             "name": list_obj.get("name", name),
             "type": list_obj.get("taskListType"),
             "shared_to_all": list_obj.get("sharedToAll") == "true",
+            "emoji": raw_emoji if raw_emoji else None,
+            "color": list_obj.get("color") or None,
         },
         ensure_ascii=False,
         indent=2,