Adds tests for freeing the temporary ext_resource sub-scene instance; the animated foreground tests dispose their frame textures.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Push-based event chains, runtime fixes (single end, goto lifecycle, if, busy box, held delay, empty options, timed/animated/effect actions), the 'flag name value' DSL command, autoplay --dialogs=N, 19 mod unit tests.