Add RobertEngineV10 fabric physics engine

[Copilot]

Implements the RobertEngineV10 class — a fabric physics simulation engine for TRYONYOU's virtual try-on pipeline (Patent PCT/EP2025/067317).

New: api/robert_engine.py

Four simulation modules:

• Fabric Physics (_calculate_physics) — Lafayette Factor (drape-based width expansion), Gravity Stretch (up to 15% elongation by GSM), Elasticity Breathing (sinusoidal oscillation)
• Visual Effects (_get_visual_effects) — Silk highlight for friction < 0.35, fold shadows (3 or 5 by drape threshold), golden scan line on a 2 000 ms cycle when fit_score < 95
• Accessory Rendering (get_accessory_render) — Body-anchored (80% of shoulder width) or floating-exhibition mode (18% of canvas), fixed alpha=0.88
• Frame Processing (process_frame) — Orchestrates the above, returns a signed buffer with patent metadata including recovery_status (STABLE/DEGRADED based on fabric recovery > 85)

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

The PILOT_COLLECTION class attribute defines 5 pilot looks (eg0–eg4) with per-fabric parameters: drape, gsm, elasticity, recovery, friction. Unknown look_id values fall back silently to eg0.

New: tests/test_robert_engine.py

36 unit tests across all modules — pilot collection integrity, physics outputs, visual effect triggers, accessory dimension/mode logic, and frame metadata correctness.

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Project	Deployment	Actions	Updated (UTC)
tryonyou-pilot	Error		Apr 7, 2026 1:57pm