feat: remove Supabase, bundle questions locally, use JSON DB + API

fix: cancel button actually cancels matchmaking

fix: batch of 5 stability fixes

fix(spark): Batches 2 + 3 — atomic ELO, real DB IDs, polish

fix(spark): Batch 1 — practice ELO leak, schema alignment, RLS tightening

feat(spark): add custom match invite link with waiting screen and copy button

feat(spark): rewrite landing page with hero preview, CTAs, leaderboard, deferred spectrum

feat(spark): open matchmaking + persist practice debates to DB

feat(spark): practice mode awards half ELO

feat(spark): complete debate arena rework to conversational flow

feat(spark): update judge with arc-based criteria and challenge support

feat(spark): add inter-round commentary API endpoint

feat(spark): swap AI arguments to Claude Sonnet 4.6 with 150-word cap

fix: leaderboard tracking, score bugs, mobile admin, OG image

feat: make multiplayer matchmaking snappy and engaging

feat: improve UX and player tracking

fix: simplify topic selection — host picks, guest receives

fix: resolve multiplayer matchmaking race condition in Spark debates

feat: redesign Spark landing page with arena aesthetic

feat: add OG social images for Triviaverse, Spark, and Game Night

fix: judge now scores on debate technique -- rebuttals, pressure, consistency

fix: judge evaluates delivery/reasoning/engagement, not crowd appeal

fix: simplify judge and stop AI opponent from fabricating anecdotes

fix: judge now penalizes repetitive emotional appeals and rewards specificity

fix: ensure "Different topics" generates 3 fully new topics

refactor: rewrite judge prompt for crowd-persuasion scoring

fix: completely rewrite fact-checker to only flag objectively false claims

fix: fact-checker must not cite single org as sole authority

fix: fact-checker bias and AI word limit

fix: AI opponent takes opposite side based on spectrum + judge anti-style bias

fix: judge must track cross-round references and contradictions

feat: add full debate transcript and expandable rounds to verdict

fix: add explicit bias prevention rules to judge prompt

fix: overhaul judge and AI opponent for substantive debate

feat: allow users to suggest custom debate topics

fix: make debate topics substantive and real-world

fix: resolve all type errors from spectrum redesign

feat(spark): update admin panel and registration for spectrum

feat(spark): update debate room and components for spectrum redesign

feat(spark): update matchmaking lobby - spectrum slider, open matchmaking

feat(spark): DB queries, API routes, and UI components for spectrum redesign

feat(spark): critical reliability - disconnect detection, API error handling, judge timeout

feat: add Spark Debate Arena tracking to admin analytics panel

fix: persist ELO ratings and games_played to database

feat: redesign judge to be qualitative instead of numeric categories

feat: add OG image and metadata for Spark Debate Arena

feat: add real-time feedback throughout the debate flow

fix: matchmaking race condition where opponent misses the match

fix: use lazy OpenAI client init to avoid build-time crash

feat: add Spark Micro-Debate Arena