cuda-ab: ctaid_probe ground-truth revision - RAWA/RAWA2, 16 values per band, PROBE2B repeat

r229 first run: PROBE1 (coordinate map) perfect; PROBE2 (flat A read)
wrong at every element - band 0 read A's own values at wrong offsets
(16382/16383 = A's last elements), bands >=1 read float-typed data. Before
concluding engine-side, the probe now records ground truth in-band:
- RAWA: A uploaded then copied straight back D2H with no kernel, first8/
  last8 printed (the buffer itself must hold i);
- RAWA2: same readback after both phases (input-corruption check);
- every band prints its raw first 16 values;
- PROBE2B: the same arow_read runs a second time into a fresh output
  buffer, so a first-attempt-only failure is the engine's per-launch
  lottery rather than addressing.

The probe's own math re-checked: A is int32 everywhere, expected is
row*256+col, and PROBE1's exact pass over the same output pipeline proves
the harness itself is sound. Committed binary rebuilt static sm_75.

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