feat: implement RobertEngineV10 fabric physics engine

[Copilot]

Adds the RobertEngineV10 class — a fabric simulation and rendering engine for the TryOnYou virtual try-on, covering drape physics, dynamic visual effects, accessory positioning, and patent-signed frame output.

api/robert_engine.py

• _calculate_physics — Lafayette drape factor, gravity stretch (up to +15% height by GSM), elasticity breathing via sin oscillation
• _get_visual_effects — dynamic silk highlights (friction < 0.35), 3/5-fold shadow gradients, golden scan line active when 0 < fit_score < 95
• get_accessory_render — bag sizing in BodyAnchor (80% shoulder width) or FloatingExhibition (18% canvas width) mode, fixed alpha 0.88
• process_frame — orchestrates all modules; returns render buffer signed with PCT/EP2025/067317 / 22_PROTECTED and STABLE/DEGRADED recovery status based on fabric recovery threshold

engine = RobertEngineV10()
result = engine.process_frame(look_id="eg0", shoulder_w=450, hip_y=900, fit_score=88, canvas_dim={"w": 1080, "h": 1920})
# result["metadata"]["patent"]  → "PCT/EP2025/067317"
# result["metadata"]["recovery_status"]  → "STABLE"

tests/test_robert_engine.py

27 unit tests across all four modules — pilot collection integrity, physics correctness, visual effect conditions, accessory modes, and full frame output shape/values.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tryonyou-pilot	Error		Apr 7, 2026 1:43pm