Playable HTML5 release guard\n\n- Repairs the itch.io browser build by selecting the complete Butler upload and hiding the obsolete manual ZIP with missing hashed assets.\n- Adds a static-package verifier for missing assets, empty files, directory escapes, and nonportable root-relative paths.\n- Runs package verification in both Quality and GitHub Pages before publication.\n- Documents the single browser-playable upload rule and live iframe verification command.\n\nVerified with 37 deterministic and unit tests, 19 Chromium journeys, production build, static package validation, live itch iframe validation, and a clean dependency audit.