Carries iter2 close state forward. Lists 7 candidate research questions
(A frame-11 EINVAL, B DEBUG sweep, C perf binding cell, D multi-context
safety, E V4L2_MEMORY_DMABUF as Option B for true DMA-BUF lifecycle fix,
F Firefox RDD sandbox, G Sonnet 7.x carryovers) plus recommended
pairings.
Candidate F enriched with Sonnet web research: NO existing Mozilla bug
covers V4L2-stateless request-API; Bug 1833354 (FF116) is V4L2-M2M only.
Sandbox allowlist in SandboxBrokerPolicyFactory.cpp::GetRDDPolicy() +
AddV4l2Dependencies() filters by V4L2_CAP_VIDEO_M2M, explicitly excluding
Hantro stateless. /dev/media* completely absent from allowlist. Patch
needed is small in scope (~30 lines, 2 functions, 1 file) following the
renderD128 broker pattern. Real Mozilla patch needed, not env-var-only.
Stop point at Phase 1 lock — user picks among A..G.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
