Rebrand as Semantika with honest, inspiration-based claims

Applies the brand platform consistently across the codebase:

- Name: Semantika everywhere — app name/slug/scheme, bundle ids
  (com.semantika.app), workspace package names, CDK stack, Cognito
  domain prefix, secret name (semantika/app), database name, product
  ids (semantika_monthly/_yearly), and storage keys.
- System instructions: Semantika is positioned as an intelligent
  reflection partner — not therapy, not self-help, not a course. It
  starts by exploring how the user interprets their situation and
  supports reflection and perspective-taking rather than delivering
  finished answers. Tone rules added: never judging, dramatic,
  overenthusiastic or preaching; always calm, curious, clear,
  respectful, structured, thoughtful.
- Honest claims: instructions and knowledge base now explicitly frame
  neurosemantics and NLP as models and inspiration for reflection, not
  scientifically established methods — including a note that several
  NLP claims lack support in controlled studies. Claiming or implying
  proven effects is forbidden.
- README: brand section (position, promise, mission, vision,
  positioning, tone, design words) and updated product philosophy.

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

apps/mobile/src/auth/session.ts

@@ -19,7 +19,7 @@ interface StoredSession {
   expiresAt: number; // epoch ms
 }
 
-const STORE_KEY = 'neurosemantics.session';
+const STORE_KEY = 'semantika.session';
 
 const discovery: DiscoveryDocument = {
   authorizationEndpoint: `${appConfig.cognitoDomain}/oauth2/authorize`,
@@ -27,7 +27,7 @@ const discovery: DiscoveryDocument = {
   revocationEndpoint: `${appConfig.cognitoDomain}/oauth2/revoke`,
 };
 
-const redirectUri = makeRedirectUri({ scheme: 'neurosemantics', path: 'redirect' });
+const redirectUri = makeRedirectUri({ scheme: 'semantika', path: 'redirect' });
 
 /** Maps our provider names to Cognito hosted UI identity providers. */
 const IDP: Record<Provider, string | undefined> = {