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/lib/store.ts

@@ -1,103 +0,0 @@
-/**
- * Global app state via Zustand.
- * Keeps runtime state; persistent data lives in storage.ts.
- */
-
-import { create } from 'zustand';
-import type { KeyFile, Contact, Chat, Message, ContactRequest, NodeSettings } from './types';
-
-interface AppState {
-  // Identity
-  keyFile:    KeyFile | null;
-  username:   string | null;
-  setKeyFile: (kf: KeyFile | null) => void;
-  setUsername: (u: string | null) => void;
-
-  // Node settings
-  settings:     NodeSettings;
-  setSettings:  (s: Partial<NodeSettings>) => void;
-
-  // Contacts
-  contacts:    Contact[];
-  setContacts: (contacts: Contact[]) => void;
-  upsertContact: (c: Contact) => void;
-
-  // Chats (derived from contacts + messages)
-  chats:    Chat[];
-  setChats: (chats: Chat[]) => void;
-
-  // Active chat messages
-  messages:    Record<string, Message[]>;  // key: contactAddress
-  setMessages: (chatId: string, msgs: Message[]) => void;
-  appendMessage: (chatId: string, msg: Message) => void;
-
-  // Contact requests (pending)
-  requests:    ContactRequest[];
-  setRequests: (reqs: ContactRequest[]) => void;
-
-  // Balance
-  balance:    number;
-  setBalance: (b: number) => void;
-
-  // Loading / error states
-  loading:  boolean;
-  setLoading: (v: boolean) => void;
-  error:    string | null;
-  setError: (e: string | null) => void;
-
-  // Nonce cache (to avoid refetching)
-  nonce:    number;
-  setNonce: (n: number) => void;
-}
-
-export const useStore = create<AppState>((set, get) => ({
-  keyFile:    null,
-  username:   null,
-  setKeyFile: (kf) => set({ keyFile: kf }),
-  setUsername: (u) => set({ username: u }),
-
-  settings: {
-    nodeUrl:    'http://localhost:8081',
-    contractId: '',
-  },
-  setSettings: (s) => set(state => ({ settings: { ...state.settings, ...s } })),
-
-  contacts:    [],
-  setContacts: (contacts) => set({ contacts }),
-  upsertContact: (c) => set(state => {
-    const idx = state.contacts.findIndex(x => x.address === c.address);
-    if (idx >= 0) {
-      const updated = [...state.contacts];
-      updated[idx] = c;
-      return { contacts: updated };
-    }
-    return { contacts: [...state.contacts, c] };
-  }),
-
-  chats:    [],
-  setChats: (chats) => set({ chats }),
-
-  messages:    {},
-  setMessages: (chatId, msgs) => set(state => ({
-    messages: { ...state.messages, [chatId]: msgs },
-  })),
-  appendMessage: (chatId, msg) => set(state => {
-    const current = state.messages[chatId] ?? [];
-    if (current.find(m => m.id === msg.id)) return {};
-    return { messages: { ...state.messages, [chatId]: [...current, msg] } };
-  }),
-
-  requests:    [],
-  setRequests: (reqs) => set({ requests: reqs }),
-
-  balance:    0,
-  setBalance: (b) => set({ balance: b }),
-
-  loading:    false,
-  setLoading: (v) => set({ loading: v }),
-  error:      null,
-  setError:   (e) => set({ error: e }),
-
-  nonce:    0,
-  setNonce: (n) => set({ nonce: n }),
-}));