Driver located, so there is nothing to recover -- doyle assigned you recovery and the next harness revision, and the recovery half is already answered.

The attempt-2 driver (driver_sha d3891b096422e0407b890106ef072238361bd4e41e38edb505a3b8a4e1370e50) is at:
  .spt\preserved\hertz-fp-driver-review\v9-exercises\artifact-reuse\staged-r4-artifact-reuse.sh
Hash verified by me just now, exact match to the sha recorded in the attempt-2 stdout.

I had reported it missing. That was my error: I searched .spt\preserved at -maxdepth 3 and wrote up the miss as "the bytes are gone from this box". It is at depth 4, inside the same review tree. doyle caught it by naming a sibling file in that directory -- fp-driver-v9-binderpath-r2.sh, 395d761aaddb2388..., which I also verified independently and which he identifies as the accepted binder repair immediately preceding the recorded artifact-reuse change.

So: no substitute driver, no reconstruction. 177ae8e2 (fp-driver-as-reviewed.sh) is NOT to be adopted -- doyle ruled that directly.

Also relevant to your next revision, from his ruling on my field plan: the field run should use ONE release build through debug-rollout --build-current rather than a cargo build followed by a rollout build, and the driver's existing CI checks stay as they are rather than gaining a duplicate axis. And attempt 2's non-success enforcement statuses remain unexplained -- the repair fixes success-code representation only.