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- MobileGL/MG_Test/Wire, 42 gtest cases in five binaries, ctest label `unit`, registered only when MOBILEGL_BUILD_DISAGGREGATED is ON so the default configuration is untouched. - FdPassingTest is the one the earlier branch could not have had: it forks a child that creates a shared segment, fills 64 KiB with a pattern and hands the descriptor over SCM_RIGHTS; the parent adopts it, maps it read-only and compares every byte. Everything in Feat/CS-Delta-IPC ran in one process, which is why `out->fd = -1` survived unnoticed. It also pins that a too-small sideband buffer is refused before the datagram is consumed (so no descriptor is dropped), that an empty sideband still carries its fd, and that a receive with no offer times out. The `spawn` SocketDoorbell is covered in the same file because it rides the same kind of socket: a parked waiter woken through NotifyIfParked, a clean timeout, and a wakeup that arrives before anyone parks being remembered and then consumed exactly once. - RingTest: control-page size/alignment/cache-line layout, a non-power-of-two capacity refused, payload alignment, 200 records driven through a 256-byte ring so the wrap filler path runs repeatedly and no record ever straddles the boundary, backpressure (full ring refuses, applied alone frees nothing, retired frees), a record larger than the ring refused, the generation bump refused while records are in flight and accepted once quiesced, a corrupt header refused instead of dispatched, and a 20000-record two-thread producer/consumer run checking order, content and the final cursor equality. - FramingTest: byte-at-a-time reassembly of two frames, the magic reading "MGLF" on the wire, empty payloads, a bad magic and an oversized length each latching the reader dead (the old code hung silently instead), the send-side cap, and the buffer-too-small contract keeping the message so the retry still finds it. - InProcessTransportTest: both directions, ordering, buffer-too-small, poll and timeout, shutdown draining queued messages before it closes, a blocked receiver woken by a send and by a shutdown, the frame cap, descriptor hand-off with its sideband, and three condvar doorbell cases - a parked waiter woken through NotifyIfParked, an already-true condition that must never park, and a clean timeout. - ProtocolSmokeTest: a Hello built and read back through the committed generated header, a Welcome carrying the four segment announcements, the same buffer travelling across the transport unchanged, a truncated buffer failing verification rather than being read, and the CtrlMsg / SegmentKind / LogLevel / FatalCode tag values frozen - they are wire numbers, so if that test has to be edited the schema change was a wire break. - CI: a `flatc-check` job in test.yml that checks out only the flatbuffers submodule, builds the pinned flatc through scripts/gen_protocol.py into the runner temp directory, regenerates and runs `git diff --exit-code` on protocol_generated.h. It needs no MobileGL build, so it does not depend on build-linux (plan B section 8.1 / earlier section 7.1: the committed header plus a CI regeneration check, and no flatc in the default build graph). - Verified: `ctest -L unit` is green in both configurations - 1382 cases with the option OFF and 1424 with it ON (the same 1382 plus these 42); the nm gate is 0 matches OFF and 93 ON; regeneration of protocol_generated.h is byte-identical, and the flatc-check gate goes red on a hand-edited header and green again after a clean regeneration.