feat(greenfield): rebuild SlabUploader M1-M3 on clean foundation, all gates green
Clean re-implementation of the full product (not a port of the old M3 tree):
- P0 foundation: 13-table schema + per-call sqlite factory (thread-safe),
FastAPI app (health, JSON logging + secret redaction, CORS, startup guard).
- P1 M1 Capture: mask/sheetKeep, geometry/rect (min-area rect), measure,
png crop/inventory/overlay, EXIF decodeOrientedBitmap.
- P2 M2 Photos: stateful capture session (batch, pick-cal, apply mask/crop
to batch) + photos-ready lineup.
- P3 M3 Create: real backend (crypto, woo client, taxonomy sync, pricing,
inference Call1/Call2, review, publish, settings, slabs, photos) + real FE
review/publish/settings screens consuming the API (no hardcoded Woo ids).
- P4 gate exit: check_requirements + check_coverage both exit 0
(137/155 IDs, 0 gaps); backend 130/130, frontend 150/150, build green.
Cite: docs/REQUIREMENTS.md (155 rows), docs/MILESTONES.md M1-M3.
Ty
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