Add routed Modal multi-model deployment

fix: invalidate stale game assets after deploy

fix: slow player movement

fix: preserve character colors in canvas renderer

feat: add layered animated player sprite

feat: redesign world map

fix: prioritize typed answers for model grading

fix: polish answer feedback and tablet controls

fix: fall back when preloaded models are missing

chore: make model preload configurable

feat: add dual-model inference runtime

test: tolerate quoted auth cookies

Revert "fix: harden generated lesson quality"

fix: harden generated lesson quality

feat: polish Secret Student game experience

fix: preserve authentication in Space iframe

feat: add embedded llama.cpp and Modal LLM runtimes

feat: polish Secret Student game flow and LLM reliability

initial commit