v12.2: Set overlay_opacity=0.65 for production (67-100% scan rate)

v12.1: Fix QR alignment (496->512px resize), reduce feather to 16px, bump overlay to 60%

v12: Art + QR overlay pipeline (M=1.30, 55% overlay with blur+feather)

v11: art-first pipeline — 512px QR sizing, lower CN weights, single-pass default

v10.2: Fix art quality — lower P2 strength 0.35→0.12, P2 Monster 2.00→1.30, P1 start 0.00→0.05

v10.1: Increase P1 Monster default to 1.50 for better scannability

Add qrcode[pil] for server-side QR generation

v10: Two-pass pipeline (txt2img→img2img) + server-side QR generation

v9: Dual ControlNet (Monster + Brightness) for scannable art

v8: Single CN 1.80 — calibrated for diffusers parallel processing

v7.1: remove QR_TAGS from prompt (ControlNet handles QR structure, not prompt)

v7: stacked ControlNet (1.60+1.20=2.80) matching ComfyUI gold standard

v6: match ComfyUI gold standard — DPM++ Karras, CN 1.45, 512-in-768 QR, pre-blur

v5: ALL passes use txt2img — fix fundamental img2img scannability failure

fix: critical Pass 3 bug (output discarded) + strength 0.55/0.65 + full guidance start

fix: absolute CN targets for Pass 2/3 — guaranteed scannability

fix: add numpy for QR preprocessing

fix: gray QR preprocessing + boost cn_weights for scannability

Initial handler: SD 1.5 + QR Monster v2, adaptive 2/3 pass pipeline

initial commit