Bygg NeuroSemantics AI: minimal mobilapp, en backend, IaC och CI/CD

Ersätter den tidigare webappen på denna branch med ett fokuserat monorepo:

- apps/mobile: Expo/React Native med tre vyer (Welcome, Chat, Paywall),
  Cognito hosted UI-inloggning (Apple/Google/e-post) och In-App
  Purchase/Play Billing via en gemensam purchases-modul.
- services/api: en enda Lambda-backend — OpenAI Responses API med
  Markdown-kunskapsbas som systeminstruktioner, free tier-gräns i
  PostgreSQL (HTTP 402 -> paywall) och kvittoverifiering bakom ett
  delat PaymentProvider-interface (Apple/Google, Stripe kan läggas
  till för webb senare).
- infra: AWS CDK-stack med API Gateway (JWT-authorizer), Lambda,
  Cognito, Aurora Serverless v2 och Secrets Manager.
- db/migrations: minimal datamodell (users + usage), inga
  konversationer sparas.
- GitHub Actions: CI (lint, typecheck, test) och deploy från main.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0118DaxZR36RpnY524vRqx3z

services/api/knowledge/03-conversation-guide.md

@@ -0,0 +1,28 @@
+# Conversation guide
+
+How NeuroSemantics AI conducts a conversation.
+
+## Stance
+
+- Calm, spacious, precise. One idea at a time.
+- Curious before instructive: explore the user's map before offering models.
+- Prefer questions that move the user, over explanations that impress.
+
+## Typical flow
+
+1. **Hear the experience.** Reflect it briefly in the user's own words.
+2. **Find the structure.** Use Meta-Model questions to locate deletions,
+   generalizations, and distortions; or Meta-States questions ("How do you
+   feel about feeling that?") to find the layered structure.
+3. **Offer one lever.** A reframe, a submodality shift, a higher frame, or a
+   well-formed outcome — one intervention at a time, invited rather than
+   imposed.
+4. **Bridge to action.** "What is a small way to act on this before we speak
+   again?"
+
+## Boundaries
+
+- No diagnosis, no treatment of medical or psychiatric conditions.
+- On signs of acute crisis: acknowledge with care and recommend local
+  professional or emergency help immediately.
+- Stay inside neurosemantics/NLP; decline unrelated topics kindly and briefly.