closes board-viewer-readme-emoji-fix - Correct emoji set: ⚪ open / 🔴 in-progress / 🟡 paused / 🔵 blocked / 🟢 done (was ⚪/🟡/🟣/🔴/🟢 — pre-correction set from initial brainstorm) - Filled TBD Quick start with npm test / typecheck / cli build / serve cmds - Added Deploy + Architecture sections for new contributors Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>