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/types.ts

@@ -1,86 +0,0 @@
-// ─── Key material ────────────────────────────────────────────────────────────
-
-export interface KeyFile {
-  pub_key:      string;  // hex Ed25519 public key  (32 bytes)
-  priv_key:     string;  // hex Ed25519 private key (64 bytes)
-  x25519_pub:   string;  // hex X25519 public key   (32 bytes)
-  x25519_priv:  string;  // hex X25519 private key  (32 bytes)
-}
-
-// ─── Contact ─────────────────────────────────────────────────────────────────
-
-export interface Contact {
-  address:    string;  // Ed25519 pubkey hex — blockchain address
-  x25519Pub:  string;  // X25519 pubkey hex  — encryption key
-  username?:  string;  // @name from registry contract
-  alias?:     string;  // local nickname
-  addedAt:    number;  // unix ms
-}
-
-// ─── Messages ─────────────────────────────────────────────────────────────────
-
-export interface Envelope {
-  sender_pub:    string;  // X25519 hex
-  recipient_pub: string;  // X25519 hex
-  nonce:         string;  // hex 24 bytes
-  ciphertext:    string;  // hex NaCl box
-  timestamp:     number;  // unix seconds
-}
-
-export interface Message {
-  id:        string;
-  from:      string;   // X25519 pubkey of sender
-  text:      string;
-  timestamp: number;
-  mine:      boolean;
-}
-
-// ─── Chat ────────────────────────────────────────────────────────────────────
-
-export interface Chat {
-  contactAddress: string;  // Ed25519 pubkey hex
-  contactX25519:  string;  // X25519 pubkey hex
-  username?:      string;
-  alias?:         string;
-  lastMessage?:   string;
-  lastTime?:      number;
-  unread:         number;
-}
-
-// ─── Contact request ─────────────────────────────────────────────────────────
-
-export interface ContactRequest {
-  from:       string;   // Ed25519 pubkey hex
-  x25519Pub:  string;   // X25519 pubkey hex; empty until fetched from identity
-  username?:  string;
-  intro:      string;   // plaintext intro (stored on-chain)
-  timestamp:  number;
-  txHash:     string;
-}
-
-// ─── Transaction ─────────────────────────────────────────────────────────────
-
-export interface TxRecord {
-  hash:      string;
-  type:      string;
-  from:      string;
-  to?:       string;
-  amount?:   number;
-  fee:       number;
-  timestamp: number;
-  status:    'confirmed' | 'pending';
-}
-
-// ─── Node info ───────────────────────────────────────────────────────────────
-
-export interface NetStats {
-  total_blocks:   number;
-  total_txs:      number;
-  peer_count:     number;
-  chain_id:       string;
-}
-
-export interface NodeSettings {
-  nodeUrl:    string;
-  contractId: string;  // username_registry contract
-}