vgsp: fail4 r235 - A-TRACE dir tag + 64KB copies exempt from bigcopy budgetHEADmaster

r235: only 4 of the probe's ~9 64KB copies reached the ring (the
sema_bigcopy_log budget had absorbed the rest - the A H2D is missing
entirely), and the events lack direction/buffer identity. Now:

- every total==65536 copy bypasses the bigcopy budget (its own 128-line
  A-TRACE budget still bounds volume) so the probe's H2D and all D2H
  readbacks always appear;
- A-TRACE carries dir=H2D/D2H (device=VID low-pa, host=SYS high-pa) plus
  pt=P1/P2 (upload read/landed) or P4/P4R (readback source/result).

r235 decode so far: the A upload lands ([0 1 2 3] in device pa 0x7800000
at t=.94) and the SAME device page is later rewritten to
[16382 16383 8193 8194] - h_A's own values at shifted offsets - with the
pattern repeated across consecutive device pages (0x7800000/0x7810000/
0x7820000), i.e. a repeated-page/offset-wrapped write inside the emulated
copy or engine path, not client-side. The trace fix makes the next capture
name the exact path (missing H2D included).

(cherry picked from commit 9b35145136c949405c7fb4d22b3405c174ecb055)

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