Fix pony repo and surface daemon swap failures (Arc integration)

Integration on the real Arc B580 uncovered two issues:

- The pony repo AstraliteHeart/pony-diffusion-v6-xl is gated (HF returns
  401 Repository Not Found), so swaps to it failed. Point the pony key at
  kitty7779/ponyDiffusionV6XL, an ungated diffusers-format mirror with
  safetensors weights that loads cleanly via the existing fp16 fallback.
- The wrapper swallowed a failed model swap: under set -e the unguarded
  swap curl aborted the script with exit 0 and no message. Capture the
  /model response and HTTP status, print the daemon's error, and exit 1
  when the swap does not return 200.

sdxl, realvis, and pony all verified end to end (one-shot + daemon),
output owned by the host user, peak within the 12GB budget.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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