chore(release): clean up repo for v0.0.1 release

Excluded from release bundle:
- CONTEXT.md, CHANGELOG.md (agent/project working notes)
- client-app/ (React Native messenger — tracked separately)
- contracts/hello_go/ (unused standalone example)

Kept contracts/counter/ and contracts/name_registry/ as vm-test fixtures
(referenced by vm/vm_test.go; NOT production contracts).

Docs refactor:
- docs/README.md — new top-level index with cross-references
- docs/quickstart.md — rewrite around single-node as primary path
- docs/node/README.md — full rewrite, all CLI flags, schema table
- docs/api/README.md — add /api/well-known-version, /api/update-check
- docs/contracts/README.md — split native (Go) vs WASM (user-deployable)
- docs/update-system.md — new, full 5-layer update system design
- README.md — link into docs/, drop CHANGELOG/client-app references

Build-time version system (inherited from earlier commits this branch):
- node --version / client --version with ldflags-injected metadata
- /api/well-known-version with {build, protocol_version, features[]}
- Peer-version gossip on dchain/version/v1
- /api/update-check against Gitea release API
- deploy/single/update.sh with semver guard + 15-min systemd jitter

client-app/components/ui/Avatar.tsx

@@ -1,37 +0,0 @@
-import React from 'react';
-import { View, Text } from 'react-native';
-import { cn } from '@/lib/utils';
-
-/** Deterministic color from a string */
-function colorFor(str: string): string {
-  const colors = [
-    'bg-blue-600', 'bg-purple-600', 'bg-green-600',
-    'bg-pink-600',  'bg-orange-600', 'bg-teal-600',
-    'bg-red-600',   'bg-indigo-600', 'bg-cyan-600',
-  ];
-  let h = 0;
-  for (let i = 0; i < str.length; i++) h = (h * 31 + str.charCodeAt(i)) >>> 0;
-  return colors[h % colors.length];
-}
-
-interface AvatarProps {
-  name?:      string;
-  size?:      'sm' | 'md' | 'lg';
-  className?: string;
-}
-
-const sizeMap = {
-  sm: { outer: 'w-8 h-8',   text: 'text-sm'  },
-  md: { outer: 'w-10 h-10', text: 'text-base' },
-  lg: { outer: 'w-14 h-14', text: 'text-xl'  },
-};
-
-export function Avatar({ name = '?', size = 'md', className }: AvatarProps) {
-  const initials = name.slice(0, 2).toUpperCase();
-  const { outer, text } = sizeMap[size];
-  return (
-    <View className={cn(outer, colorFor(name), 'rounded-full items-center justify-center', className)}>
-      <Text className={cn(text, 'text-white font-bold')}>{initials}</Text>
-    </View>
-  );
-}

client-app/components/ui/Badge.tsx

@@ -1,24 +0,0 @@
-import React from 'react';
-import { View, Text } from 'react-native';
-import { cn } from '@/lib/utils';
-
-interface BadgeProps {
-  label:      string | number;
-  variant?:   'default' | 'success' | 'destructive' | 'muted';
-  className?: string;
-}
-
-const variantMap = {
-  default:     'bg-primary',
-  success:     'bg-success',
-  destructive: 'bg-destructive',
-  muted:       'bg-surfaceHigh border border-border',
-};
-
-export function Badge({ label, variant = 'default', className }: BadgeProps) {
-  return (
-    <View className={cn('rounded-full px-2 py-0.5 items-center justify-center', variantMap[variant], className)}>
-      <Text className="text-white text-xs font-semibold">{label}</Text>
-    </View>
-  );
-}

client-app/components/ui/Button.tsx

@@ -1,76 +0,0 @@
-import React from 'react';
-import { Pressable, Text, ActivityIndicator } from 'react-native';
-import { cva, type VariantProps } from 'class-variance-authority';
-import { cn } from '@/lib/utils';
-
-const buttonVariants = cva(
-  'flex-row items-center justify-center rounded-xl px-5 py-3 active:opacity-80',
-  {
-    variants: {
-      variant: {
-        default:     'bg-primary',
-        secondary:   'bg-surfaceHigh border border-border',
-        destructive: 'bg-destructive',
-        ghost:       'bg-transparent',
-        outline:     'bg-transparent border border-primary',
-      },
-      size: {
-        sm:   'px-3 py-2',
-        md:   'px-5 py-3',
-        lg:   'px-6 py-4',
-        icon: 'p-2',
-      },
-    },
-    defaultVariants: {
-      variant: 'default',
-      size:    'md',
-    },
-  },
-);
-
-const textVariants = cva('font-semibold text-center', {
-  variants: {
-    variant: {
-      default:     'text-white',
-      secondary:   'text-white',
-      destructive: 'text-white',
-      ghost:       'text-primary',
-      outline:     'text-primary',
-    },
-    size: {
-      sm:   'text-sm',
-      md:   'text-base',
-      lg:   'text-lg',
-      icon: 'text-base',
-    },
-  },
-  defaultVariants: {
-    variant: 'default',
-    size:    'md',
-  },
-});
-
-interface ButtonProps extends VariantProps<typeof buttonVariants> {
-  onPress?:   () => void;
-  disabled?:  boolean;
-  loading?:   boolean;
-  children:   React.ReactNode;
-  className?: string;
-}
-
-export function Button({
-  variant, size, onPress, disabled, loading, children, className,
-}: ButtonProps) {
-  return (
-    <Pressable
-      onPress={onPress}
-      disabled={disabled || loading}
-      className={cn(buttonVariants({ variant, size }), disabled && 'opacity-50', className)}
-    >
-      {loading
-        ? <ActivityIndicator color="#fff" size="small" />
-        : <Text className={textVariants({ variant, size })}>{children}</Text>
-      }
-    </Pressable>
-  );
-}

client-app/components/ui/Card.tsx

@@ -1,16 +0,0 @@
-import React from 'react';
-import { View } from 'react-native';
-import { cn } from '@/lib/utils';
-
-interface CardProps {
-  children:   React.ReactNode;
-  className?: string;
-}
-
-export function Card({ children, className }: CardProps) {
-  return (
-    <View className={cn('bg-surface border border-border rounded-2xl p-4', className)}>
-      {children}
-    </View>
-  );
-}

client-app/components/ui/Input.tsx

@@ -1,34 +0,0 @@
-import React, { forwardRef } from 'react';
-import { TextInput, View, Text, type TextInputProps } from 'react-native';
-import { cn } from '@/lib/utils';
-
-interface InputProps extends TextInputProps {
-  label?:     string;
-  error?:     string;
-  className?: string;
-}
-
-export const Input = forwardRef<TextInput, InputProps>(
-  ({ label, error, className, ...props }, ref) => (
-    <View className="w-full gap-1">
-      {label && (
-        <Text className="text-muted text-sm font-medium mb-1">{label}</Text>
-      )}
-      <TextInput
-        ref={ref}
-        placeholderTextColor="#8b949e"
-        className={cn(
-          'bg-surfaceHigh border border-border rounded-xl px-4 py-3 text-white text-base',
-          error && 'border-destructive',
-          className,
-        )}
-        {...props}
-      />
-      {error && (
-        <Text className="text-destructive text-xs mt-1">{error}</Text>
-      )}
-    </View>
-  ),
-);
-
-Input.displayName = 'Input';

client-app/components/ui/Separator.tsx

@@ -1,7 +0,0 @@
-import React from 'react';
-import { View } from 'react-native';
-import { cn } from '@/lib/utils';
-
-export function Separator({ className }: { className?: string }) {
-  return <View className={cn('h-px bg-border my-2', className)} />;
-}

client-app/components/ui/index.ts

@@ -1,6 +0,0 @@
-export { Button }    from './Button';
-export { Card }      from './Card';
-export { Input }     from './Input';
-export { Avatar }    from './Avatar';
-export { Badge }     from './Badge';
-export { Separator } from './Separator';