fix(fable-mcp): fix streaming error handling and bump timeout for SSE

- stream_get now reads error responses before calling _raise_for_status
  (httpx raises on .json()/.text access inside an unread stream context)
- Raise read timeout to 120s (was 30s) so generation streams don't timeout
- Document "generation" as a valid category for fable_get_app_logs

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

fable-mcp/fable_mcp/client.py

@@ -36,7 +36,7 @@ class FableClient:
         self._client = httpx.AsyncClient(
             base_url=self.base_url,
             headers=self._headers,
-            timeout=30.0,
+            timeout=httpx.Timeout(connect=10.0, read=120.0, write=30.0, pool=10.0),
         )
         return self
 
@@ -91,7 +91,9 @@ class FableClient:
     async def stream_get(self, path: str, **kwargs: Any) -> AsyncIterator[str]:
         """Yield non-empty lines from a streaming GET response (SSE)."""
         async with self._http().stream("GET", path, **kwargs) as response:
-            self._raise_for_status(response)
+            if response.is_error:
+                await response.aread()
+                self._raise_for_status(response)
             async for line in response.aiter_lines():
                 if line:
                     yield line