Release 0.1.8 — Start new healthcheck from the finished panel (hc-vt5)

A finished session showed only the next-due prompt and download/discard
buttons — the only way onward was Discard, which reads as destructive even
though it just clears the local cache. Add a prominent "Start new healthcheck"
button that clears the finished session from the cache and starts a fresh one
for the same site_key (so history links up and the prior handover notes seed
the new session). The finished record stays on the history server.

Bumps plugin header, ATT_HC_VERSION and updates.json so PUC offers it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

includes/admin-page.php

@@ -3,6 +3,7 @@ if (!defined('ABSPATH')) exit;
 
 add_action('admin_menu', 'att_hc_register_menu');
 add_action('admin_post_att_hc_start', 'att_hc_handle_start');
+add_action('admin_post_att_hc_start_next', 'att_hc_handle_start_next');
 add_action('admin_post_att_hc_resume', 'att_hc_handle_resume');
 add_action('wp_ajax_att_hc_step_history', 'att_hc_handle_step_history_ajax');
 add_action('wp_ajax_att_hc_save_step_ajax', 'att_hc_handle_save_step_ajax');
@@ -55,6 +56,7 @@ function att_hc_inline_css(): string {
         .att-hc-status-skipped { background:#fff3cd; color:#856404; }
         .att-hc-status-blocked { background:#fbeae8; color:#721c24; }
         .att-hc-status-n_a { background:#e2e3e5; color:#41464b; }
+        .att-hc-start-next { margin:.5rem 0 1rem; display:flex; flex-wrap:wrap; align-items:center; gap:.6rem; }
         .att-hc-next-due { margin:.5rem 0 .75rem; padding:.5rem .75rem; background:#f6f7f7; border:1px solid #dcdcde; border-radius:4px; }
         .att-hc-next-due form { display:flex; flex-wrap:wrap; align-items:center; gap:.5rem; }
         .att-hc-next-due .description { flex-basis:100%; }
@@ -714,11 +716,20 @@ function att_hc_render_finished_panel(ATT_HC_Session $session): void {
         <h2>Healthcheck finished</h2>
         <p>Started <?php echo esc_html(date('Y-m-d H:i', $session->started_at())); ?> · Finished <?php echo esc_html(date('Y-m-d H:i', (int) $session->finished_at())); ?></p>
         <?php att_hc_render_next_due_form($session); ?>
+        <div class="att-hc-start-next">
+            <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" style="display:inline">
+                <?php wp_nonce_field('att_hc_start_next'); ?>
+                <input type="hidden" name="action" value="att_hc_start_next">
+                <input type="hidden" name="site_key" value="<?php echo esc_attr($session->site_key()); ?>">
+                <button class="button button-primary">Start new healthcheck</button>
+            </form>
+            <span class="description">Begins a fresh session for <code><?php echo esc_html($session->site_key()); ?></code>. This finished report stays on the history server.</span>
+        </div>
         <div class="att-hc-actions">
             <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" style="display:inline">
                 <?php wp_nonce_field('att_hc_download_report'); ?>
                 <input type="hidden" name="action" value="att_hc_download_report">
-                <button class="button button-primary">Download Markdown</button>
+                <button class="button">Download Markdown</button>
             </form>
             <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" style="display:inline">
                 <?php wp_nonce_field('att_hc_download_html'); ?>
@@ -769,6 +780,43 @@ function att_hc_handle_start(): void {
     exit;
 }
 
+/**
+ * Start a fresh healthcheck straight from the finished panel, without making the
+ * technician Discard first (Discard reads as destructive, though it only clears
+ * the local cache). Only acts on a finished session; the finished record stays
+ * on the history server.
+ */
+function att_hc_handle_start_next(): void {
+    if (!current_user_can('manage_options')) wp_die('Forbidden');
+    check_admin_referer('att_hc_start_next');
+
+    $current = ATT_HC_Session::current();
+    // Guard: only from a finished session. If an active one is somehow current,
+    // don't clobber it — just send the technician back to it.
+    if ($current && !$current->is_finished()) {
+        wp_safe_redirect(admin_url('tools.php?page=att-site-healthcheck'));
+        exit;
+    }
+
+    // Keep the engagement's site_key so history links up and the just-finished
+    // session's handover notes seed the new "before" notes (see start()).
+    $site_key = isset($_POST['site_key']) && $_POST['site_key'] !== ''
+        ? sanitize_text_field(wp_unslash((string) $_POST['site_key']))
+        : ($current ? $current->site_key() : null);
+
+    // Drop the finished session from the local cache so start() creates a new one.
+    // The finished record remains on the server.
+    ATT_HC_Session::discard();
+
+    try {
+        ATT_HC_Session::start(get_current_user_id(), $site_key);
+    } catch (ATT_HC_Api_Exception $e) {
+        set_transient('att_hc_api_error', 'Could not start a new healthcheck: ' . $e->getMessage(), 60);
+    }
+    wp_safe_redirect(admin_url('tools.php?page=att-site-healthcheck'));
+    exit;
+}
+
 function att_hc_handle_save_next_due(): void {
     if (!current_user_can('manage_options')) wp_die('Forbidden');
     check_admin_referer('att_hc_save_next_due');