docs: Spark landing page redesign implementation plan

docs: Spark landing page redesign spec

docs: Spark debate rework implementation plan

docs: Spark debate arena rework design spec

docs: spectrum redesign implementation plan

docs: spectrum redesign design doc for Spark debate arena

feat: add Spark Micro-Debate Arena

feat: replace Master's Lair with WebGL cosmic descent

docs: add 20-task implementation plan for Triviaverse V2

docs: add Triviaverse V2 full platform design