Release 0.1.5 — AJAX auto-save on the reporting page (hc-66c)

The step cards saved via a full-page POST, and the reload broke the
technician's flow. Save in place instead:

- Status saves on change; notes save on blur (only when actually edited).
- Inline per-card feedback (Saving… / Saved ✓ / error), no reload.
- On a status change the header badge updates live and the escalation
  banner shows/hides itself, matching a full server render.

Progressive enhancement: a new wp_ajax_att_hc_save_step_ajax handler reuses
the same capability + nonce + step validation + write-through as the form
handler, which is kept as the no-JS fallback. Mirrors the existing
step-history AJAX loader.

Bumps the plugin header, ATT_HC_VERSION and updates.json so PUC offers this
to installed sites. Server-side unaffected — this is plugin-only.

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

att-site-healthcheck.php

@@ -2,7 +2,7 @@
 /**
  * Plugin Name: ATT Site Healthcheck
  * Description: Walks a technician through a structured WordPress site healthcheck. Steps are drop-in PHP files so adding/removing one is a single file change.
- * Version:     0.1.4
+ * Version:     0.1.5
  * Author:      Steve Hanlon
  * License:     Proprietary
  * License URI: https://git.h12e.com/steve/wp-healthcheck/raw/branch/main/LICENSE
@@ -15,7 +15,7 @@ if (!defined('ABSPATH')) {
     exit;
 }
 
-define('ATT_HC_VERSION', '0.1.4');
+define('ATT_HC_VERSION', '0.1.5');
 define('ATT_HC_PLUGIN_FILE', __FILE__);
 define('ATT_HC_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('ATT_HC_PLUGIN_URL', plugin_dir_url(__FILE__));