2026-09-01 - mutexattr-round-trip now reports per-type read-back

015-sync/mutexattr-round-trip reported only the count of types that round-trip (4 of 5 on hardware) - which cannot say WHICH type does not, the one fact an emulator needs to match it. Added a per-type measure (type-N-read-back) reporting what Gettype reads back after Settype(type), or -1 where Set refused or Get failed - using the already-declared mutexattr functions, so no surface/import change, and only appending measure lines (report-interface safe). make host builds clean (-Werror) and runs: the host stub round-trips 0-3 and refuses 4 (res stays 4). A hardware run will now name orbistoun's target: which of the five the console normalises or rejects. make check passes (EXIT 0).