diff --git a/hubzilla/addon/scn01/config.json.template b/hubzilla/addon/scn01/config.json.template
new file mode 100644
index 0000000..4964c98
--- /dev/null
+++ b/hubzilla/addon/scn01/config.json.template
@@ -0,0 +1,5 @@
+{
+  "_note": "Copy to config.json. Do not commit config.json — it contains secrets and installation-specific values. Access-state (associations/groups) is NOT duplicated here — scn01 reads addon/vs01/config.json as the single source of truth for that.",
+  "receiver_url": "REPLACE — orchestrator receiver endpoint, e.g. https://orchestrator1.internal.diagnostics.kane-il.us/receive-scn",
+  "node_token": "REPLACE — shared secret for node-to-orchestrator authentication"
+}
diff --git a/hubzilla/addon/scn01/scenarios.json b/hubzilla/addon/scn01/scenarios.json
new file mode 100644
index 0000000..3eec99d
--- /dev/null
+++ b/hubzilla/addon/scn01/scenarios.json
@@ -0,0 +1,30 @@
+{
+  "_note": "Sanitized scenario library for scn01. Each entry is an operator/participant-sanitized account, tagged with a single open-vocabulary category. Edited by operator/expert participants over time. Used to populate the browse carousel on /scn01/{association_slug}.",
+  "scenarios": [
+    {
+      "id": "scn-001",
+      "category": "Porch Pirates",
+      "text": "The HOA has not done anything about packages being stolen from porches. Multiple residents have reported missing deliveries, but no notice, camera policy, or response has come from the board."
+    },
+    {
+      "id": "scn-002",
+      "category": "Noise Complaint",
+      "text": "The same residents across several units have been playing loud music late at night, seemingly on purpose. Complaints have not resulted in any visible action."
+    },
+    {
+      "id": "scn-003",
+      "category": "Towing",
+      "text": "A guest's car was towed overnight from a space marked for guest parking. No warning was posted and no notice was given before the tow."
+    },
+    {
+      "id": "scn-004",
+      "category": "Excessive Maintenance Charges",
+      "text": "The lawn is being mowed three times a week, which feels excessive. The frequency was not discussed with homeowners and the cost implications are unclear."
+    },
+    {
+      "id": "scn-005",
+      "category": "Surprise Charges",
+      "text": "A one-time charge appeared on the account for removing a tree that had been dead for years. There was no advance notice that this charge was coming or why it was billed now."
+    }
+  ]
+}
diff --git a/hubzilla/addon/scn01/scn01.php b/hubzilla/addon/scn01/scn01.php
index b89e764..300ab51 100644
--- a/hubzilla/addon/scn01/scn01.php
+++ b/hubzilla/addon/scn01/scn01.php
@@ -2,14 +2,17 @@
 
 /**
  * Name: SCN01 Scenarios
- * Description: Public civic diagnostic — browse and submit diagnostic scenarios.
- * Version: 0.2.0
+ * Description: Public civic diagnostic — browse and submit diagnostic scenarios in plain language.
+ * Version: 0.3.0
  * MinVersion: 11.0
  * MaxVersion: 12.0
  */
 
 use Zotlabs\Extend\Widget;
 
+require_once 'addon/scn01/scn01_renderer.php';
+require_once 'addon/scn01/scn01_spool.php';
+
 function scn01_module() {}
 
 function scn01_load() {
@@ -101,7 +104,7 @@ function scn01_access_state($association_slug = '') {
             intval($prof_gid),
             dbesc($observer)
         );
-        if ($r) return 'participant';
+        if ($r) return 'professional';
     }
 
     return 'public';
@@ -127,7 +130,7 @@ function scn01_access_wall($association_slug = '') {
 }
 
 // ---------------------------------------------------------------------------
-// CONTENT
+// CONTENT ROUTER
 // ---------------------------------------------------------------------------
 
 function scn01_content() {
@@ -140,37 +143,40 @@ function scn01_content() {
 
     $association_slug = argv(1) ?? '';
 
+    // Index — no association selected
+    if (!$association_slug) {
+        return scn01_render_index();
+    }
+
+    $raw = @file_get_contents('addon/vs01/config.json');
+    $cfg = $raw ? json_decode($raw, true) : [];
+    if (json_last_error() !== JSON_ERROR_NONE || !isset($cfg['associations'][$association_slug])) {
+        return scn01_render_not_found();
+    }
+
     $access = scn01_access_state($association_slug);
 
-    // scn01 is public — access wall only gates submission, not reading
+    // POST — submission handler
     if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if ($access === 'public') {
             return scn01_access_wall($association_slug);
         }
-        // TODO: handle POST submission
-        return scn01_access_wall($association_slug);
+        if (!scn01_verify_csrf()) {
+            return '<div class="alert alert-danger">Invalid form token. Please reload and try again.</div>';
+        }
+        return scn01_handle_post($association_slug, $access);
     }
 
-    return scn01_render_main($access);
+    // Association landing — carousel + submission form
+    return scn01_render_landing($association_slug, $access);
 }
 
 // ---------------------------------------------------------------------------
-// RENDER
+// NOT FOUND
 // ---------------------------------------------------------------------------
 
-function scn01_render_main($access) {
-    $out  = '<div class="scn01-content">';
-    $out .= '<div class="scn01-header mb-3">';
-    $out .= '<h2>Scenarios</h2>';
-    $out .= '<p class="text-muted">Browse diagnostic scenarios. When you find one close to your situation, submit your account in your own words.</p>';
-    $out .= '</div>';
-
-    // TODO: render scenarios
-
-    $out .= '<div class="scn01-placeholder text-muted fst-italic">Content forthcoming.</div>';
-    $out .= '</div>';
-
-    return $out;
+function scn01_render_not_found() {
+    return '<div class="scn01-content"><div class="alert alert-warning">Association not found.</div></div>';
 }
 
 // ---------------------------------------------------------------------------
diff --git a/hubzilla/addon/scn01/scn01_renderer.php b/hubzilla/addon/scn01/scn01_renderer.php
new file mode 100644
index 0000000..821e85d
--- /dev/null
+++ b/hubzilla/addon/scn01/scn01_renderer.php
@@ -0,0 +1,117 @@
+<?php
+
+/**
+ * SCN-01 Renderer
+ * Renders the scenario browse carousel and submission form.
+ * Carousel/pin interaction is client-side — see view/js/scn01.js.
+ */
+
+// ---------------------------------------------------------------------------
+// SCENARIOS LOADING
+// ---------------------------------------------------------------------------
+
+function scn01_load_scenarios() {
+    $raw = @file_get_contents('addon/scn01/scenarios.json');
+    if ($raw === false) return [];
+    $data = json_decode($raw, true);
+    if (json_last_error() !== JSON_ERROR_NONE) return [];
+    return $data['scenarios'] ?? [];
+}
+
+// ---------------------------------------------------------------------------
+// RENDER — INDEX (association picker)
+// ---------------------------------------------------------------------------
+
+function scn01_render_index() {
+    $out  = '<div class="scn01-content">';
+    $out .= '<div class="scn01-header mb-3">';
+    $out .= '<h2>Scenarios</h2>';
+    $out .= '<p class="text-muted">Browse examples of situations other homeowners have experienced. When something looks familiar, select it and describe your own situation in your own words.</p>';
+    $out .= '</div>';
+
+    $raw = @file_get_contents('addon/vs01/config.json');
+    $cfg = $raw ? json_decode($raw, true) : [];
+    $associations = $cfg['associations'] ?? [];
+
+    if (!empty($associations)) {
+        $out .= '<ul class="list-group">';
+        foreach ($associations as $slug => $assoc) {
+            $name = scn01_h($assoc['name'] ?? $slug);
+            $url  = z_root() . '/scn01/' . scn01_h($slug);
+            $out .= '<li class="list-group-item"><a href="' . $url . '">' . $name . '</a></li>';
+        }
+        $out .= '</ul>';
+    } else {
+        $out .= '<div class="scn01-placeholder text-muted fst-italic">No associations registered.</div>';
+    }
+
+    $out .= '</div>';
+    return $out;
+}
+
+// ---------------------------------------------------------------------------
+// RENDER — ASSOCIATION LANDING (carousel + form)
+// ---------------------------------------------------------------------------
+
+function scn01_render_landing($association_slug, $access) {
+    $raw   = @file_get_contents('addon/vs01/config.json');
+    $cfg   = $raw ? json_decode($raw, true) : [];
+    $assoc = $cfg['associations'][$association_slug] ?? [];
+    $name  = scn01_h($assoc['name'] ?? $association_slug);
+
+    $scenarios = scn01_load_scenarios();
+
+    $out  = '<div class="scn01-content">';
+    $out .= '<div class="scn01-header mb-3">';
+    $out .= '<h2>' . $name . '</h2>';
+    $out .= '<p class="text-muted">Browse the scenarios below. Select up to 5 that feel similar to your situation, then describe what happened in your own words.</p>';
+    $out .= '</div>';
+
+    // Data island — consumed entirely by scn01.js, no PHP logic beyond this.
+    $out .= '<script type="application/json" id="scn01-data">'
+          . json_encode(['scenarios' => $scenarios], JSON_UNESCAPED_SLASHES)
+          . '</script>';
+
+    // Pinned strip — populated client-side
+    $out .= '<div id="scn01-pinned" class="scn01-pinned" aria-label="Pinned scenarios"></div>';
+
+    // Carousel — populated client-side
+    $out .= '<div class="scn01-carousel">';
+    $out .= '<button type="button" id="scn01-prev" class="btn btn-sm btn-outline-secondary" aria-label="Previous scenario">&larr;</button>';
+    $out .= '<div id="scn01-card" class="scn01-card"></div>';
+    $out .= '<button type="button" id="scn01-next" class="btn btn-sm btn-outline-secondary" aria-label="Next scenario">&rarr;</button>';
+    $out .= '</div>';
+
+    if ($access === 'public') {
+        $out .= '<div class="alert alert-info mt-3">';
+        $out .= 'Scenarios are public. ';
+        $out .= '<a href="https://directory.diagnostics.kane-il.us/channel/theron">Complete the SASE process</a> ';
+        $out .= 'to submit your own account for this association.';
+        $out .= '</div>';
+        $out .= '</div>';
+        return $out;
+    }
+
+    $form_url = z_root() . '/scn01/' . scn01_h($association_slug);
+
+    $out .= '<form method="post" action="' . $form_url . '" id="scn01-form" class="scn01-form mt-3" novalidate>';
+    $out .= scn01_csrf_token();
+    $out .= '<div id="scn01-pinned-fields"></div>';
+
+    $out .= '<div class="scn01-narrative">';
+    $out .= '<label for="scn01_narrative"><strong>Describe your situation</strong></label>';
+    $out .= '<textarea id="scn01_narrative" name="narrative" class="form-control" rows="6" placeholder="In your own words, describe what happened."></textarea>';
+    $out .= '</div>';
+
+    $out .= '<div class="alert alert-warning mt-2 small">';
+    $out .= 'Once submitted, this record cannot be edited. If you want to add more later, you will need to submit a new record.';
+    $out .= '</div>';
+
+    $out .= '<div class="mt-2">';
+    $out .= '<button type="submit" class="btn btn-primary">Submit</button>';
+    $out .= '</div>';
+    $out .= '</form>';
+
+    $out .= '</div>';
+    return $out;
+}
diff --git a/hubzilla/addon/scn01/scn01_spool.php b/hubzilla/addon/scn01/scn01_spool.php
new file mode 100644
index 0000000..873ff09
--- /dev/null
+++ b/hubzilla/addon/scn01/scn01_spool.php
@@ -0,0 +1,150 @@
+<?php
+
+/**
+ * SCN-01 Spool Handler
+ * Validates POST submissions, builds the spool envelope,
+ * and POSTs to the orchestrator receiver.
+ * Records are immutable — no edit path.
+ */
+
+// ---------------------------------------------------------------------------
+// POST HANDLER
+// ---------------------------------------------------------------------------
+
+function scn01_handle_post($association_slug, $access) {
+    $narrative = isset($_POST['narrative'])
+        ? substr(strip_tags((string) $_POST['narrative']), 0, 8192)
+        : '';
+
+    $raw_pinned = $_POST['pinned_scenario_ids'] ?? [];
+    $pinned = [];
+    if (is_array($raw_pinned)) {
+        $valid_ids = array_column(scn01_load_scenarios(), 'id');
+        foreach ($raw_pinned as $id) {
+            $id = trim((string) $id);
+            if (in_array($id, $valid_ids, true) && !in_array($id, $pinned, true)) {
+                $pinned[] = $id;
+            }
+        }
+        $pinned = array_slice($pinned, 0, 5);
+    }
+
+    if ($narrative === '') {
+        $out  = '<div class="alert alert-danger"><strong>Please describe your situation before submitting.</strong></div>';
+        $out .= scn01_render_landing($association_slug, $access);
+        return $out;
+    }
+
+    $cfg_raw = @file_get_contents('addon/vs01/config.json');
+    $cfg     = $cfg_raw ? json_decode($cfg_raw, true) : [];
+    $assoc   = $cfg['associations'][$association_slug] ?? [];
+
+    $envelope = scn01_build_spool_envelope(
+        $narrative,
+        $pinned,
+        $association_slug,
+        $assoc['channel_id'] ?? '',
+        $access
+    );
+
+    $result = scn01_post_to_orchestrator($envelope);
+
+    if ($result === true) {
+        $assoc_name = scn01_h($assoc['name'] ?? $association_slug);
+        return '<div class="scn01-content">
+                    <div class="alert alert-success">
+                        Your account for ' . $assoc_name . ' has been submitted. Records cannot be edited —
+                        if you want to add more later, submit a new record.
+                        <a href="' . z_root() . '/vs01/' . scn01_h($association_slug) . '">
+                            Return to ' . $assoc_name . '
+                        </a>
+                    </div>
+                </div>';
+    }
+
+    $out  = '<div class="alert alert-danger">
+                Submission failed. Please try again or contact the operator.
+                <br><small>' . scn01_h($result) . '</small>
+            </div>';
+    $out .= scn01_render_landing($association_slug, $access);
+    return $out;
+}
+
+// ---------------------------------------------------------------------------
+// SPOOL ENVELOPE
+// ---------------------------------------------------------------------------
+
+function scn01_build_spool_envelope($narrative, $pinned_scenario_ids, $association_slug, $channel_id, $standing) {
+    return [
+        'addon'                   => 'scn01',
+        'contract_version'        => '1.0',
+        'association_slug'        => $association_slug,
+        'association_channel_id'  => (string) $channel_id,
+        'submitted_at'            => date('c'),
+        'standing'                => $standing,
+        'pinned_scenario_ids'     => $pinned_scenario_ids,
+        'narrative'               => $narrative,
+    ];
+}
+
+// ---------------------------------------------------------------------------
+// ORCHESTRATOR POST
+// ---------------------------------------------------------------------------
+
+function scn01_post_to_orchestrator($envelope) {
+    $config       = scn01_load_config();
+    $receiver_url = $config['receiver_url'] ?? '';
+    $node_token   = $config['node_token'] ?? '';
+
+    if (!$receiver_url) {
+        logger('scn01_spool: receiver_url not configured');
+        return 'Orchestrator receiver URL not configured.';
+    }
+
+    $payload = json_encode($envelope);
+    if ($payload === false) {
+        logger('scn01_spool: failed to encode envelope');
+        return 'Failed to encode submission.';
+    }
+
+    $ch = curl_init($receiver_url);
+    curl_setopt_array($ch, [
+        CURLOPT_POST           => true,
+        CURLOPT_POSTFIELDS     => $payload,
+        CURLOPT_RETURNTRANSFER => true,
+        CURLOPT_TIMEOUT        => 10,
+        CURLOPT_HTTPHEADER     => [
+            'Content-Type: application/json',
+            'X-Node-Token: ' . $node_token,
+        ],
+    ]);
+
+    $response   = curl_exec($ch);
+    $http_code  = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    $curl_error = curl_error($ch);
+    curl_close($ch);
+
+    if ($curl_error) {
+        logger('scn01_spool: curl error: ' . $curl_error);
+        return 'Network error: ' . $curl_error;
+    }
+
+    if ($http_code === 200 || $http_code === 201) {
+        return true;
+    }
+
+    logger('scn01_spool: orchestrator returned HTTP ' . $http_code . ': ' . $response);
+    return 'Orchestrator error (HTTP ' . $http_code . ').';
+}
+
+// ---------------------------------------------------------------------------
+// CONFIG
+// ---------------------------------------------------------------------------
+
+function scn01_load_config() {
+    $path = 'addon/scn01/config.json';
+    $raw  = @file_get_contents($path);
+    if ($raw === false) return [];
+    $data = json_decode($raw, true);
+    return (json_last_error() === JSON_ERROR_NONE) ? $data : [];
+}