feat(#3996): stream model-generated media deltas - #4023
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Extend the shared chat.MessageDelta streaming representation with typed MediaDelta entries (bytes + MIME + name + size) so generated binary media has a provider-agnostic path instead of a Gemini-only side channel. The Gemini adapter captures inline image blobs from response candidates the same way it already captures text/reasoning/tool calls/usage — retaining every blob in a chunk, not just the last — and the run() content gate forwards image-only chunks that previously would have been dropped. The runtime's stream accumulator (pkg/runtime/streaming.go) collects the deltas into streamResult.Media, accumulating before any terminal check so a final chunk that carries both media and a finish reason is never lost. Persistence of the accumulated media ships in the follow-up materialization commits.
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What
Streams model-generated media deltas through Gemini adaptation, runtime streaming, chat media types, and tests.
Why
Generated media should become available incrementally rather than waiting for the entire response.
Validation
task test; Gemini adapter and runtime streaming tests.Test instructions
Run:
task testInvoke a media-generating model and observe the chat stream. Expected: generated-media deltas arrive in order as they are received, are represented by the chat stream, and do not require waiting for the complete response.