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e3414bec9d
New `InspectorPlugin` (gated behind `inspector` feature) launches a
`kittest_inspector` child process and streams the harness's frames + accesskit
tree updates to it over framed MessagePack on stdin/stdout. The inspector
drives the harness by sending `InspectorCommand`s back; supported commands
include `Step` / `Run` / `Play` / `Pause` (deterministic stepping),
`Handle { events }` (event injection), `Resize`, and `Screenshot`.
Auto-attaches when the `KITTEST_INSPECTOR` env var is truthy — the inspector
binary path can be overridden via `KITTEST_INSPECTOR_PATH`. Uses the new
`egui_inspection::protocol` types and starts every connection with a
`HarnessMessage::Hello { peer_kind: Kittest, capabilities: KITTEST }` so the
inspector can render the right controls.
Also re-exports `egui_inspection` as `egui_kittest::inspector_api` for crates
that only depend on kittest.