Rehearsal faucet: self-serve test-POL so members can actually buy

Fresh wallets hold 0 POL on the rehearsal chain, so nobody could complete a buy.
- Oracle: the mock POL/USD feed had gone ~49h stale (quoteWei reverted "Stale
  oracle" -> catalog costWei null -> packages showed "paused"). Refreshed it and
  installed a 15-min heartbeat cron so it stays fresh; quotes now return.
- New /api/my/faucet (rehearsal-only, rate-limited) tops a connected wallet up to
  10 test-POL via anvil_setBalance (no key). "Get test POL" card in the Wallet
  pane wires it. Members can now fund, buy, and see payouts move on the ledger.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/assets/my.js

@@ -9,6 +9,7 @@
       $('boRehearsal').hidden = false;
       $('boRehearsal').innerHTML = '<b>Testnet rehearsal</b> · ' + c.chainName;
     }
+    if (c.rehearsal && $('faucetCard')) $('faucetCard').hidden = false;
   } catch (e) {}
 
   async function api(path, body) {
@@ -1191,6 +1192,14 @@
     IAP.status('Wallet linked. Earnings pay there from now on.', 'ok');
     await render();
   }));
+  if ($('faucetBtn')) $('faucetBtn').addEventListener('click', busy($('faucetBtn'), async () => {
+    IAP.status('Connect your wallet to receive test POL…');
+    const addr = await IAPWallet.connect();
+    const r = await api('/api/my/faucet', { address: addr });
+    const pol = (Number(BigInt(r.balanceWei) / (10n ** 15n)) / 1000).toFixed(3);
+    $('faucetInfo').textContent = 'Funded — balance ' + pol + ' test-POL. Head to Buy packages.';
+    IAP.status('Your wallet now holds test POL. Go buy a package.', 'ok');
+  }));
   $('activateBtn').addEventListener('click', busy($('activateBtn'), async () => {
     const me = await (await fetch('/api/me')).json();
     IAP.status('Confirm the free activation in your wallet…');