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The broad inproc census against a same-machine 11ac3de6 baseline found 183 newly-failing;
172 are the design-red the contract rules (the legacy-arm refusal under transport: the
subsystem-off and legacy control lanes, and Magma's P7 surface - every one carries its
Fatal name in ~/p5c-fatal-map.tsv), and the other eleven were three REAL regressions,
fixed here:
1. The surface-changed event drained at the first verb's EmitAndWait, but a pre-verb
glGetFramebufferAttachmentParameteriv on the default framebuffer was answered from the
placeholder attachments, and buffers allocated from that answer are blit-incompatible
with the real surface (DepthStencilReadbackAttachmentShapeScenario). The event ring
gains its SECOND drain-point class: the blocking EGL lifecycle RPC returns
(BackendObject_Remote's surface create/resize and make-current) - the same known-idle
premise as EmitAndWait's post-barrier point. CONTRACT-P5C section 4.1 amended.
2. A whole-buffer writeback larger than the event ring could never fit one record
(capacity/2), aborting the server with Fatal{EventRingOverflow} on the large-arena
readbacks. The client now slices the request at a quarter of the ring (header and
co-posted small events ride along), each slice round-tripping its own barrier + drain;
the whole-buffer flag is cleared by hand after the last slice lands, which is exactly
what WritebackFromBackend's clear says. CONTRACT-P5C section 4.4 amended.
3. ScatterCapturedRecords / ReadbackCapturedRanges read the capture buffers through the
frontend MappedData() (a layer-1 surface since gt) and wrote back by direct call. The
XFB capture path now reads the server's staged shadow (RequireStagedCoverage asserted,
syncedChangeSerial bumped so no later draw overwrites the capture with stale shadow)
and writes back through OnBufferWriteback, the Ops_H_Readback order.
CtWireScenario's two death cases skip on DirectVulkan by name: object_death's producer is
the Espryt-side death-notice ops and Magma installs none until P7.
Evidence: unit 2187/2187; integration-split 111/111; the three families' named cases green
again; census newly-failing reduced to the evidenced design-red set.