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Coverage audit (pytest --cov) found real, non-model logic at 0%/low cover. Add unit tests that need no model download: - img2img_runner.py 0% -> 100%: the MPS->CPU fallback orchestration, mocked via injected load_pipeline/reload_on_cpu callables. Guards the production behavior hit this session (native-res SDXL OOMs on MPS, must retry on CPU; non-MPS errors must propagate; "mps"-worded error on a cpu device must not reload). - ctrlregen/tiling.py 0% -> 40%: the pure tile math (tile_positions, make_blend_weight, resize_center_crop) that decides how large images are split and blended. (run_tiled stays model-bound, untested.) - isobmff.py 93% -> 100%: size==0 (box-to-EOF) and truncated 64-bit largesize parsing branches for AVIF/HEIF/JXL C2PA stripping. - c2pa.py: non-PNG-signed .png reads as clean (has_c2pa_metadata / extract_c2pa_chunk) instead of mis-parsing. 309 tests pass (+23). Document in CLAUDE.md that these pure helpers are unit-tested without downloads so future sessions don't skip them as "ML". No src/ change, no release. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>