Add chunkTimeout propagation to Vercel AI SDK streamText timeout.chunkMs
for silent stream dropout detection. The config option already existed in
the provider schema and worked at the fetch wrapper level, but was not
passed through to the streamText call. This adds dual-layer protection
at both the fetch layer and the SDK stream consumer layer.
Also updates docs to document chunkTimeout with failure scenario and
recommended values (15-30s).
Fatty911
c3e15d1486