Add role-based leaderboard cohorts

[Rajat77a]

What changed

• preserves each user's exact job title while storing one validated career track
• adds 13 career tracks with instant local classification and a rate-limited Groq fallback for uncommon titles
• lets users confirm or change the suggested track during onboarding and profile editing
• ranks completed interviews within career-track and experience cohorts using the latest five sessions
• removes generated candidates from the live public and signed-in leaderboards
• updates public copy so benchmark claims accurately describe real completed PrepPeer sessions
• includes the backward-compatible Supabase migration already validated against production

Why

Free-text role titles no longer matched the old hardcoded leaderboard tabs, which made role-based ranks inconsistent. The live board also mixed synthetic benchmark users with real accounts. This change keeps flexible titles while providing fair, truthful cohort rankings.

Validation

• npx tsc --noEmit
• npm run lint
• npm run build
• npm audit --json (0 vulnerabilities)
• Supabase migration success
• verified role-category column, classifier mappings, permissions, 29 real entries across 20 active cohorts, and no invalid cohort sizes
• existing production health remained green after the backward-compatible migration

[vercel]

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Project	Deployment	Actions	Updated (UTC)
prep-peer	Ready	Preview	Aug 10, 2026 4:59pm