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docs: SynthID v2 defeat by SDXL pipeline now verified end-to-end locally

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Local SDXL run on a Gemini 3 Pro output (snowboard scene, 2816x1536), seed 42,
strength 0.05, steps 50, ~10 min on MPS. Gemini app's "Verify with SynthID"
returned "no SynthID watermark detected" on the cleaned file. This closes the
verification gap noted in v0.4.0 release notes and confirms architectural
equivalence to the raiw-app production fal-ai/fast-sdxl path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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@@ -25,4 +25,4 @@ You are a **principal Python engineer** maintaining a CLI tool and library for r
- Pyright first run is slow (2-3 min) due to ML deps (torch/diffusers/transformers stubs)
- `ultralytics` monkey-patches `PIL.Image.open` and tries to autoload `pi_heif`. When `pi_heif` is missing, opening files raises `ModuleNotFoundError`, not `UnidentifiedImageError`. Code that opens user-supplied or unknown-format files should `except Exception`, not just `OSError`/`UnidentifiedImageError`.
- Metadata detection for AVIF/HEIF/JPEG-XL relies on a binary scan for `C2PA_UUID` + `IPTC_AI_MARKERS`. C2PA removal in those containers is implemented via `noai/isobmff.py` (top-level ``uuid`` / ``jumb`` box stripper, no re-encoding). EXIF/XMP boxes inside those containers are not yet scrubbed.
- **SynthID v2 vs default pipeline:** the SDXL-based default profile (since May 2026) defeats SynthID v2 per the deployment in raiw-app (`fal-ai/fast-sdxl` at native ~1024 px, strength 0.05, steps 50). SD-1.5 dreamshaper at 768 px was previously the default and does NOT defeat v2 — verified empirically against Gemini app's "Verify with SynthID" feature (strength 0.04, 0.10, and elastic warp α∈{5,8} all flagged positive). That SD-1.5 path was removed; only `default` (SDXL) and `ctrlregen` profiles remain.
- **SynthID v2 vs default pipeline:** the SDXL-based default profile (since May 2026) defeats SynthID v2. **Verified end-to-end (May 2026):** local SDXL run on a Gemini 3 Pro output, checked via the Gemini app's "Verify with SynthID" feature, returned "no SynthID watermark detected". The same configuration is used in raiw-app production (`fal-ai/fast-sdxl` at native ~1024 px, strength 0.05, steps 50). SD-1.5 dreamshaper at 768 px was previously the default and does NOT defeat v2 — verified empirically against the same feature (strength 0.04, 0.10, and elastic warp α∈{5,8} all flagged positive). That SD-1.5 path was removed; only `default` (SDXL) and `ctrlregen` profiles remain.