Fix load Parameter 0 error + 2D default on HF

WebGL-safe 2D trajectory fallback + enriched loss plot

Lighter Plotly payloads + intro walkthrough + run-mode UX polish

HF reliability: quick demo defaults, ETA, errors, reset

Features: modal synth, Adam compare, exports, tension calc, KaTeX, mobile

Clarity: Theory tab, presets, welcome, STRINGS, tooltips

Production: mystery shell + physics-audio from staging

Add guided onboarding, prog bank, and demo guitar G3 sample

Fix README metadata and deploy 6-string optimizer Space