forge — test apps

• forms — input, textarea, select, button classifiers
• drag — drag / drop with accept filters
• tree — surgical move / insert / replace / swap
• chunked — infinite scrolling list with live rows
• surgery — proves append/close don't rebuild subtrees
• timers — server-side one-shots and intervals
• filter — hide / show via the visibility op (no inserts/removes)
• controls — enhanced inputs (phone, currency, color, lookup, vec3)
• grid — chunked + sortable headers + global filter