Add CBOR metadata indexes, local API and coordinated auto mining

src/storage.js

@@ -1,18 +1,30 @@
+import { minerPreference } from './miner.js';
 import { LocalChain } from './adapters/chain.js';
 import { TestWallet, NETWORK } from './adapters/wallet.js';
 export const STORAGE_KEY = 'super-testnet:lab:v1';
 export function decodeLab(raw) {
-  if (!raw) return { wallet: null, chain: new LocalChain() };
+  if (!raw) return { wallet: null, chain: new LocalChain(), miner: minerPreference() };
   const data = JSON.parse(raw);
   if (data.kind !== 'test-lab' || data.network !== NETWORK || data.version !== 1) throw new Error('Unsupported lab backup.');
-  return { wallet: data.wallet ? TestWallet.load(data.wallet) : null, chain: new LocalChain(data.chain) };
+  return { wallet: data.wallet ? TestWallet.load(data.wallet) : null, chain: new LocalChain(data.chain), miner: minerPreference(data.miner) };
 }
 export const encodeLab = lab => JSON.stringify({
   kind: 'test-lab', network: NETWORK, version: 1,
-  wallet: lab.wallet?.backup() ?? null, chain: lab.chain.snapshot(),
+  wallet: lab.wallet?.backup() ?? null, chain: lab.chain.snapshot(), miner: minerPreference(lab.miner),
 });
 export const readLab = () => decodeLab(localStorage.getItem(STORAGE_KEY));
 export function saveLab(lab) {
   try { localStorage.setItem(STORAGE_KEY, encodeLab(lab)); }
   catch { throw new Error('Browser storage is full or unavailable. No changes were saved. Export a lab backup before clearing storage.'); }
 }
+
+// Shared by manual mining, auto mining, and all other lab mutations.
+export async function mutateLab(action, { locks = navigator.locks, read = readLab, save = saveLab } = {}) {
+  if (!locks) throw new Error('This app needs a secure-context browser with Web Locks. Use localhost or HTTPS.');
+  return locks.request(STORAGE_KEY, async () => {
+    const candidate = read();
+    const changed = await action(candidate);
+    if (changed !== false) save(candidate);
+    return { lab: candidate, changed: changed !== false };
+  });
+}