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Publish bounded outbound desktop drag requests - #561
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This was referenced Sep 19, 2026
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Closes #548. Advances #268 and enables SceneTech/AppScene#187.
WebScene now publishes bounded immutable outbound desktop-drag request leases and accepts copied completion. Trusted pointer activation plus movement threshold admits connected/visible/non-inert explicit draggable, default link/image, and selected-text origins. Writable dragstart DataTransfer supports data/effect/drag-image configuration; cancellation, generation validation, selected-operation completion, dragend, subtree/navigation/teardown retirement, and bounded queues/payloads are enforced. No native path/object/destination crosses the ABI; opaque grants are represented but never invented without an authority-bearing DOM binding.
Bounds: 8 queued requests, 32 items, 1 MiB metadata plus per-field caps.
Validation intentionally deferred:
git diff --checkpassed; ABI/browser link/script/selection/image/cancel/stale/cap/completion/performance regressions were authored but not executed. AppScene #187 native session consumption and package acceptance remain open.