Adds FrameStream.overlay_with for fork-join pipelines - #44
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Introduces the
Overlayframe filter and theoverlay_withbinding across all four frame-stream variants. This PR merges a frame stream with an index-aligned "sidecar" iterable that draws packet data (like a tracker output) onto eachframe. The "merge" step of a fork-join where one event stream is used both to render frames and to compute sidecar data, recombined by positional zip.
This will be necessary for frame-based operations over some stream: the "sidecar" receives a zero-copy structured-array view of each packet, making it the natural boundary to a foreign backend (like Rust via DLPack).
Includes a blob-tracker example and tests covering index alignment, in-place vs replacement draws, and cadence-mismatch error path.
I did use Claude to generate some of this, and it suggested the name "sidecar". I don't like the name, but I also don't have a better alternative...