Voiceprint — by Lightfern (Role A)

The user-facing voiceprint tool + capture gate. Paste your writing → see a glimpse → drop email/role/handle → unlock your full portrait, archetype, and shareable card. The tool is a mirror, not a judge — it never scores.

Run it

npm install
npm run dev      # http://localhost:3000  (uses next default port)

No API keys needed: the voiceprint engine and lead store both run locally.

The flow (state machine in components/VoiceprintTool.tsx)

idle (paste box) → loading → teaser (glimpse + locked preview + gate) → revealed (archetype + signature + share card + full portrait + Lightfern CTA).

Handoff contracts

These are the seams. Both sides are stubbed so Role A is demoable solo; swap in the real thing with no front-end changes.

From D — the voiceprint engine

• Endpoint: POST /api/voiceprint { text } → Voiceprint (see lib/types.ts).
• Today it's a real local text-analysis engine (lib/voiceprint.ts) that derives the portrait from rhythm, punctuation, and lexical fingerprint — so every result is genuinely personal, offline.
• To swap in Claude: replace the handler body in app/api/voiceprint/route.ts, keep the Voiceprint response shape identical. UI keeps working.

With B — the capture store (schema LOCKED)

{ id, email, role, handle, writing_sample, voiceprint_json, created_at }

• Endpoint: POST /api/lead validates and persists this row.
• Default: writes to /data/leads.json and returns { rank, total } (newest-on-board).
• To forward to B: set LEAD_FORWARD_URL (+ optional LEAD_FORWARD_KEY). The route POSTs the same row to B and passes through B's { rank, total } to the reveal.

Stack

Next.js 14 (App Router) · Tailwind · lucide-react · Instrument Serif / DM Sans / JetBrains Mono. Deploys to Vercel as-is (/data is the only local-only bit — once B's store is wired, nothing touches the filesystem).