Sync with the current Elffuss Code: edits instead of rewrites, context that fits, multilingual retrieval; README refresh

Fix the brain that stopped loading, plus workspace, Hard Work and i18n

code.tree avisa al cortar (proyectos grandes)

Fix: code.edit/search robustos en ficheros y proyectos grandes (no truncar >60KB)

Elffuss Code — browser IDE with a local AI agent (WebGPU)