Legacy bridge pages, welcome-back credits, holding-tank alerts

- /from/faucetwave and /from/tieroneads (?seg=advertiser): the squeeze page with
  brand copy and no video, sponsor cookie cleared so arrivals land in the holding
  tank, angle + a legacy:<brand> source recorded on the account.
- legacy.js: private list DATA_DIR/legacy.json (email -> brand, segment); listed
  emails get a one-time credit grant at account creation (legacyCreditsAdvertiser
  500 / legacyCreditsEarner 150, admin-editable), recorded in legacy-grants.json.
- Holding-tank alerts: dashboard payload carries who is waiting (Overview notice
  with usernames + adopt link), and a 15-minute tick posts new arrivals to the
  shared Telegram payments topic.
- Chatbot prompt lines + admin setting labels.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/assets/my.js

@@ -429,6 +429,16 @@
         const lm = $('launchMark');
         if (lm) { lm.hidden = !show; lm.innerHTML = show ? '<b>Launch ready: ' + done + ' of ' + items.length + '.</b> ' + (at && Date.now() < at ? 'Doors open ' + new Date(at).toLocaleString([], { weekday: 'short', hour: 'numeric', minute: '2-digit' }) + '. ' : '') + '<a href="/launch">Open the founding-week checklist</a>' : ''; }
       } catch (e) {}
+      // people waiting for a sponsor in the holding tank (Marty, 2026-09-12): every Overview sees it
+      try {
+        const tw = d.tankWaiting, tn = $('tankNotice');
+        if (tn) {
+          tn.hidden = !(tw && tw.count);
+          if (tw && tw.count) tn.innerHTML = '<b>' + tw.count + (tw.count === 1 ? ' person is' : ' people are') + ' waiting for a sponsor in the holding tank</b> \u00b7 '
+            + tw.names.map(esc).join(', ') + (tw.count > tw.names.length ? ' and more' : '') + '. <a href="#line">Adopt them from My line</a>'
+            + (tw.eligible ? '.' : ' (you need your own $20 package first).');
+        }
+      } catch (e) {}
       if (d.username) { // wall link rides the username
         const wl = location.origin + '/wall/' + d.username;
         $('wallLine').textContent = wl;