agent: foundation — add master brief reference docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/brief/pricing-model.md

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+<!-- Source: Kon Master Brief — §5 Pricing Model -->
+
+## 5. Pricing Model
+
+### Free tier
+Basic voice capture + local transcription + simple task list. Limited functionality (e.g. 5 active tasks or 10 stored transcriptions). Top-of-funnel — proves the core value loop.
+
+### Kon Pro — lifetime licence
+| Platform | Price |
+|---|---|
+| Desktop (Windows/macOS/Linux) | £49 |
+| Mobile (Android/iOS) | £29 |
+| All platforms bundle | £59 |
+
+Full feature set, all running locally. Unlimited transcription, templates, profiles, micro-stepping, if-then automation, history. One payment, forever. No subscription.
+
+**Positioning:** "They took away lifetime. We never will."
+
+### Kon Cloud — optional subscription (£4.99/month or £39.99/year)
+Access to frontier AI model (Claude, GPT-4o, or similar) for:
+- Higher-accuracy transcription of specialist vocabulary
+- Smarter task decomposition
+- More natural language understanding in assistant features
+
+This is the only recurring revenue stream and is genuinely tied to per-request API costs — not extractive.
+
+### Pricing rationale
+- Tiimo charges £45–£95/year with no lifetime option. Their users actively want one.
+- iA Writer's real-world data shows one-time purchases generate 2–3x more revenue than subscriptions, with significantly better retention.
+- Affinity (Serif) built a company acquired for ~£410M entirely on perpetual licences at ~£40/app.
+- Local-first architecture means near-zero ongoing infrastructure costs for the base product.
+- Cloud tier justified because it incurs real per-request costs.
+- Lifetime model works because Tauri/Rust is low-maintenance and Jake can rebuild in a day if needed.
+- Desktop price of £49 matches iA Writer exactly. Bundle at £59 creates a strong upgrade path.
+- Consider launch pricing: £49 (discounted from £59) for first 500 buyers to build social proof.
+
+### Pricing sensitivity notes
+- Adults with ADHD earn 17% less than neurotypical peers at equivalent educational levels.
+- 60% of UK adults with ADHD estimate impulse spending and forgetfulness costs them £1,600/year.
+- Forgotten subscriptions are a specific, acute financial hazard for people with executive dysfunction.
+- Lifetime pricing directly addresses the "ADHD tax" problem. Frame it explicitly: "Pay once. No subscriptions to forget. No guilt for taking a break."
+- Consider accessibility pricing (student/disability discount) or pay-what-you-want tiers for launch.
+- UK Access to Work grants (up to ~£66,000/year) can fund software tools — a potential B2B unlock.
+
+### Pre-launch pricing validation (Van Westendorp)
+Before committing to £49, send the waitlist a four-question survey via Tally (free):
+1. At what price would Kon be so expensive you'd never buy it?
+2. At what price would it seem so cheap you'd doubt its quality?
+3. At what price is it getting expensive but you'd still consider it?
+4. At what price is it a bargain?
+
+Plot the four curves — their intersections reveal the acceptable price range and optimal price point. Takes 10 minutes to set up and can prevent months of pricing regret.