implement free plan age verification via Stripe SetupIntent; personalize soul demo greeting with user name and timezone

src/checkout.el

@@ -79,7 +79,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
     let plan_desc: String = if is_founding {
         "Pay once. Neuron inference when it launches - priced below the major APIs. No subscription, ever."
     } else { if is_free {
-        "Start building your memory. No card required."
+        "Start building your memory. A card verifies you're 18+. You won't be charged."
     } else {
         "Full access. Bring your own API keys or use Neuron Inference when it launches - Q3 2026."
     } }
@@ -142,7 +142,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
 
     let auth_heading: String = if is_free {
         el_p("class=\"label\" style=\"margin-bottom: 1.5rem; color: var(--navy);\"", "Create your account.")
-        + el_p("class=\"checkout-auth-hint\" style=\"margin-bottom: 2rem;\"", "No card required. Your account is free, forever.")
+        + el_p("class=\"checkout-auth-hint\" style=\"margin-bottom: 2rem;\"", "Create your account. We'll ask for a card to verify your age - you won't be charged.")
     } else {
         el_p("class=\"label\" style=\"margin-bottom: 1.25rem;\"", "Sign in (optional)")
         + el_p("class=\"checkout-auth-hint\"", "Sign in to link this purchase to an existing account. Or skip and create one later - we'll match it to your email.")
@@ -201,15 +201,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
 
     // ── Free-tier success panel ───────────────────────────────────────────────
 
-    let free_success: String = if is_free {
-        el_div(
-            "id=\"free-success\" style=\"display:none; text-align:center; padding: 2.5rem 1rem;\"",
-            el_div("style=\"font-size:2.5rem; margin-bottom:1.25rem;\"", "✓")
-            + el_p("class=\"label\" style=\"margin-bottom:.75rem; color:var(--navy);\"", "You're in.")
-            + el_p("class=\"checkout-auth-hint\" style=\"margin-bottom:2rem;\"", "Your free account is ready. Download Neuron to get started.")
-            + el_a("/marketplace", "class=\"checkout-submit\" style=\"display:inline-block; text-decoration:none; padding:.875rem 2rem;\"", "Go to your account →")
-        )
-    } else { "" }
+    let free_success: String = ""
 
     // ── Payment section ───────────────────────────────────────────────────────
 
@@ -281,7 +273,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
         + "<path d=\"M4 7l1.5 1.5L8.5 5\" stroke=\"currentColor\" stroke-width=\"1.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"/>"
         + "</svg>"
 
-    let submit_label: String = if is_free { "Reserve free tier &#8594;" } else { "Complete purchase &#8594;" }
+    let submit_label: String = if is_free { "Verify age &amp; get started &#8594;" } else { "Complete purchase &#8594;" }
 
     let payment_form: String = el_form(
         "id=\"payment-form\" autocomplete=\"on\"",
@@ -347,9 +339,7 @@ fn checkout_page(plan: String, pub_key: String) -> String {
     let cfg_js: String = "window.NEURON_CFG=window.NEURON_CFG||{};window.NEURON_CFG.plan=\"" + plan + "\";window.NEURON_CFG.pub_key=\"" + pub_key + "\";"
     let cfg_script: String = el_script_inline(cfg_js)
     let stripe_el_script: String = el_script_src("/js/checkout-stripe.js", true)
-    let free_init_script: String = if is_free {
-        el_script_inline("document.addEventListener('DOMContentLoaded',function(){window.neuronCheckoutFree&&window.neuronCheckoutFree()});")
-    } else { "" }
+    let free_init_script: String = ""
 
     return nav_html + main_html + supabase_script + stripe_script + style_html + auth_script + cfg_script + stripe_el_script + free_init_script
 }

src/js/chat-widget.el

@@ -14,6 +14,10 @@ fn main() -> Void {
   var turnstileVerified = false;
   var isOpen = false;
   var MAX    = 10;
+  var _userName = '';
+  var _userTimezone = (typeof Intl !== 'undefined' && Intl.DateTimeFormat)
+    ? Intl.DateTimeFormat().resolvedOptions().timeZone
+    : '';
 
   // ── Supabase auth state ───────────────────────────────────────────────────
   var supabaseClient = null;
@@ -45,6 +49,11 @@ fn main() -> Void {
   }
 
   function _onWidgetAuthenticated() {
+    // Capture user name for personalized greeting
+    if (_supabaseSession && _supabaseSession.user) {
+      var _meta = _supabaseSession.user.user_metadata || {};
+      _userName = _meta.full_name || _meta.name || _supabaseSession.user.email || '';
+    }
     var authPane = document.getElementById('neuron-demo-auth');
     var gate     = document.getElementById('neuron-demo-gate');
     var msgs     = document.getElementById('neuron-demo-messages');
@@ -60,10 +69,8 @@ fn main() -> Void {
         if (session && session.messages && session.messages.length > 0) {
           session.messages.forEach(function(m) { addMsg(m.role, m.text, true); });
         } else if (!session.greeted) {
-          addMsg('ai', 'Hey. What is on your mind?', true);
-          session.greeted = true;
-          saveSession(session);
-        }
+            _sendIntroGreeting();
+          }
       }
       var inp = document.getElementById('neuron-demo-text');
       if (inp) inp.focus();
@@ -247,10 +254,61 @@ fn main() -> Void {
     }
   }
 
+  function _timeOfDay() {
+    var h = new Date().getHours();
+    if (h < 12) return 'morning';
+    if (h < 17) return 'afternoon';
+    if (h < 21) return 'evening';
+    return 'night';
+  }
+
+  function _sendIntroGreeting() {
+    if (session.greeted) return;
+    session.greeted = true;
+    saveSession(session);
+    var accessToken = (_supabaseSession && _supabaseSession.access_token) ? _supabaseSession.access_token : '';
+    fetch('/api/demo', {
+      method: 'POST',
+      headers: {'Content-Type': 'application/json'},
+      body: JSON.stringify({
+        message: '__intro_phase1__',
+        history: [],
+        cf_token: '',
+        uid: session.uid || '',
+        access_token: accessToken,
+        user_name: _userName,
+        user_timezone: _userTimezone,
+        time_of_day: _timeOfDay(),
+        is_return: session.count > 0 ? 'true' : 'false',
+        activated_nodes: [],
+        engram_node_count: 0,
+        questions_remaining: MAX,
+        is_last_question: false
+      })
+    })
+    .then(function(r) { return r.json(); })
+    .then(function(d) {
+      var reply = d.response || d.reply || d.message || '';
+      if (reply) {
+        addMsg('ai', reply, true);
+        session.messages = session.messages || [];
+        session.messages.push({ role: 'ai', text: reply });
+        saveSession(session);
+      } else {
+        addMsg('ai', 'Hey. What\'s on your mind?', true);
+      }
+    })
+    .catch(function() {
+      addMsg('ai', 'Hey. What\'s on your mind?', true);
+    });
+  }
+
   window.neuronDemoReset = function() {
     if (_headerResetInterval) { clearInterval(_headerResetInterval); _headerResetInterval = null; }
     clearSession();
     session  = { messages: [], count: 0, context: '' };
+    session.uid = 'u' + Date.now().toString(36) + Math.random().toString(36).slice(2, 7);
+    saveSession(session);
     msgCount = 0;
     var msgs  = document.getElementById('neuron-demo-messages');
     if (msgs)  msgs.innerHTML = '';
@@ -258,7 +316,7 @@ fn main() -> Void {
     if (input) { input.disabled = false; input.placeholder = 'Ask me anything...'; }
     var btn   = document.getElementById('neuron-demo-send');
     if (btn)   btn.disabled = false;
-    addMsg('ai', 'Hey. What is on your mind?', true);
+    _sendIntroGreeting();
   };
 
   window.neuronDemoToggle = function() {
@@ -277,9 +335,7 @@ fn main() -> Void {
           if (input) { input.disabled = true; input.placeholder = 'Interaction limit reached'; }
         }
       } else if (!session.greeted) {
-        addMsg('ai', 'Hey. What is on your mind?', true);
-        session.greeted = true;
-        saveSession(session);
+        _sendIntroGreeting();
       }
     }
     var input = document.getElementById('neuron-demo-text');
@@ -315,8 +371,8 @@ fn main() -> Void {
                   if (gate)     gate.style.display     = 'none';
                   if (msgs)     msgs.style.display     = 'flex';
                   if (inputRow) inputRow.style.display = 'flex';
-                  addMsg('ai', 'Hey. What is on your mind?', true);
                   updateCountdown();
+                  _sendIntroGreeting();
                   var inp = document.getElementById('neuron-demo-text');
                   if (inp) inp.focus();
                 },
@@ -454,6 +510,9 @@ fn main() -> Void {
           cf_token:           turnstileVerified && !session._cfSent ? turnstileToken : '',
           uid:                session.uid || '',
           access_token:       accessToken,
+          user_name:          _userName,
+          user_timezone:      _userTimezone,
+          time_of_day:        _timeOfDay(),
           activated_nodes:    activated_nodes,
           engram_node_count:  (session._m && session._m.nodes) ? session._m.nodes.length : 0,
           questions_remaining: questionsRemaining,

src/js/checkout-auth.el

@@ -36,15 +36,8 @@ fn main() -> Void {
     if (user && user.id) { window._neuronSupaId = user.id; }
     var auth = document.getElementById('auth-section');
     if (auth) auth.style.display = 'none';
-    var isFree = (window.NEURON_CFG || {}).plan === 'free';
-    if (isFree) {
-      // Free plan: show the success panel (user is signed in or just signed up)
-      var freeSuccess = document.getElementById('free-success');
-      if (freeSuccess) freeSuccess.style.display = '';
-    } else {
-      var payment = document.getElementById('payment-section');
-      if (payment) payment.style.display = '';
-    }
+    var payment = document.getElementById('payment-section');
+    if (payment) payment.style.display = '';
 
     if (user) {
       var badge = document.getElementById('auth-badge');
@@ -65,11 +58,9 @@ fn main() -> Void {
       if (emailEl) emailEl.value = user.email;
     }
 
-    if (!isFree) {
-      var userEmail = user ? (user.email || '') : '';
-      var userName  = user ? ((user.user_metadata && user.user_metadata.full_name) || '') : '';
-      if (typeof window.initStripe === 'function') window.initStripe(userEmail, userName);
-    }
+    var userEmail = user ? (user.email || '') : '';
+    var userName  = user ? ((user.user_metadata && user.user_metadata.full_name) || '') : '';
+    if (typeof window.initStripe === 'function') window.initStripe(userEmail, userName);
   }
 
   function checkExistingSession() {

src/main.el

@@ -666,10 +666,6 @@ fn handle_request_inner(method: String, path: String, headers: Map, body: String
         }
         let timing: String = json_get_string(body, "timing")
         if str_eq(timing, "") { let timing = "now" }
-        // Free tier: no card required. Return immediately — no Stripe interaction.
-        if str_eq(plan, "free") {
-            return "{\"plan\":\"free\",\"free\":true,\"no_payment_required\":true}"
-        }
         // Hard cap: block founding checkouts when 1,000 spots are filled
         if str_eq(plan, "founding") {
             let current_sold: Int = get_sold()
@@ -701,6 +697,25 @@ fn handle_request_inner(method: String, path: String, headers: Map, body: String
             }
         }
 
+        // Free tier: creates a SetupIntent for age verification (18+ requirement).
+        // No charge — but the user must provide a valid payment method.
+        if str_eq(plan, "free") {
+            let free_si_body: String = "automatic_payment_methods[enabled]=true"
+                + "&usage=off_session"
+                + "&metadata[plan]=free"
+                + "&metadata[purpose]=age_verification"
+            let free_si_body = if !str_eq(pi_cus_id, "") { free_si_body + "&customer=" + pi_cus_id } else { free_si_body }
+            let free_si_resp: String = http_post_form_auth(
+                "https://api.stripe.com/v1/setup_intents",
+                free_si_body,
+                auth_header)
+            if str_starts_with(free_si_resp, "{") {
+                let inner: String = str_slice(free_si_resp, 1, str_len(free_si_resp))
+                return "{\"setup_mode\":true,\"plan\":\"free\"," + inner
+            }
+            return free_si_resp
+        }
+
         // Setup-mode path: save payment method, do not charge. Only valid
         // for Professional (Founding is one-shot lifetime, charges immediately).
         if str_eq(plan, "professional") && str_eq(timing, "later") {
@@ -1390,6 +1405,14 @@ fn handle_request_inner(method: String, path: String, headers: Map, body: String
             let qrem_safe: String = if str_eq(qrem_str, "") { "10" } else { qrem_str }
             let is_last_str: String = json_get(body, "is_last_question")
             let is_last_safe: String = if str_eq(is_last_str, "true") { "true" } else { "false" }
+            let user_name_raw: String = json_get_string(body, "user_name")
+            let user_tz_raw:   String = json_get_string(body, "user_timezone")
+            let tod_raw:       String = json_get_string(body, "time_of_day")
+            let is_return_raw: String = json_get_string(body, "is_return")
+            let user_name_safe: String = str_replace(str_replace(user_name_raw, "\\", "\\\\"), "\"", "\\\"")
+            let user_tz_safe:   String = str_replace(str_replace(user_tz_raw, "\\", "\\\\"), "\"", "\\\"")
+            let tod_safe:       String = str_replace(str_replace(tod_raw, "\\", "\\\\"), "\"", "\\\"")
+            let is_return_safe: String = if str_eq(is_return_raw, "true") { "true" } else { "false" }
             // Look up the configured chat model from public.neuron_config
             // (Phase 1 runtime config store). 60s TTL caching, falls back
             // to the hardcoded default on Supabase miss / error.
@@ -1398,7 +1421,7 @@ fn handle_request_inner(method: String, path: String, headers: Map, body: String
             // Build inner content with history and engram context for thread context.
             // soul-demo unwraps payload from the dharma envelope, then reads
             // model with json_get(body, "model") - so this propagates end to end.
-            let inner: String = "{\"event_type\":\"chat\",\"payload\":{\"message\":\"" + msg_safe + "\",\"history\":" + hist_safe + ",\"an\":" + an_safe + ",\"ec\":" + ec_safe + ",\"questions_remaining\":" + qrem_safe + ",\"is_last_question\":" + is_last_safe + ",\"model\":\"" + model_safe + "\"}}"
+            let inner: String = "{\"event_type\":\"chat\",\"payload\":{\"message\":\"" + msg_safe + "\",\"history\":" + hist_safe + ",\"an\":" + an_safe + ",\"ec\":" + ec_safe + ",\"questions_remaining\":" + qrem_safe + ",\"is_last_turn\":" + is_last_safe + ",\"model\":\"" + model_safe + "\",\"user_name\":\"" + user_name_safe + "\",\"user_timezone\":\"" + user_tz_safe + "\",\"time_of_day\":\"" + tod_safe + "\",\"is_return\":\"" + is_return_safe + "\"}}"
             // Escape inner for the outer content field
             let inner_safe: String = str_replace(str_replace(inner, "\\", "\\\\"), "\"", "\\\"")
             // Build dharma envelope with per-user channel