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Add bounded sandboxed download handoff - #536
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This was referenced Sep 19, 2026
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Nested webview downloads lacked browser-shaped sandbox admission and a typed immutable transfer boundary. This adds a download request/lease ABI that requires recent native activation plus
allow-downloadsthrough every sandboxed owner, preserves origin and document/frame generations, and carries bounded byte, URL, or canvas source identity without choosing a destination or granting filesystem authority.Queued leases retire on navigation, taken leases retain generation data for stale-host rejection, and release represents cancellation. Limits cover request count, 64 MiB per and aggregate queued byte payload, names/origins, MIME, and source URLs. Authored regressions cover activation/sandbox denial, Blob/data/canvas identity, sanitization, generation metadata, and child-navigation cancellation.
Only
git diff --checkran under the current implementation-first policy. AppScene destination UI/grants/large-file streaming plus native/browser execution, lifecycle, performance, package, and unchanged-product evidence remain deferred under #32/#123/#268.Closes #535
Progresses #268