feat(recommendations): collect demographics and advance age cohorts

packages/core/src/index.ts

@@ -27,3 +27,5 @@ export { checkServer, normalizeServerUrl, type ServerCheck } from './server';
 export { initialWaveState, mix, rgb, rgba, step, WAVE_COLORS, waveScale, type Rgb, type WaveState } from './wave-anim';
 
 export { WaveCoordinator, EARLY_SKIP_MS, WAVE_REFILL_AT, type WaveInfo, type WaveOutcome, type WaveFeedback, type WaveGateway } from './wave';
+
+export { AGE_GROUPS, GENDERS } from './onboarding';

packages/core/src/onboarding.ts

@@ -0,0 +1,2 @@
+export const AGE_GROUPS = ['under_13', '13_19', '20_29', '30_39', '40_49', '50_59', '60_plus'] as const;
+export const GENDERS = ['male', 'female', 'other'] as const;