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>

updates.json

@@ -1,12 +1,12 @@
 {
     "name": "ATT Site Healthcheck",
     "slug": "att-site-healthcheck",
-    "version": "0.1.4",
+    "version": "0.1.5",
     "author": "Steve Hanlon",
     "requires": "6.0",
     "tested": "6.6",
     "requires_php": "7.4",
-    "last_updated": "2026-07-23 12:03:38",
+    "last_updated": "2026-07-27 08:27:04",
     "download_url": "https://git.h12e.com/steve/wp-healthcheck/archive/main.zip",
     "sections": {
         "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.",