docs: Divi guides shortform/placeholders, hints name the write tools; test: Divi write end-to-end; version 0.3.0

- Hints (PostPresenter::DIVI_NOTE, outline, catalog) and server instructions (tree_rev rule)
  name the Divi write tools; guides divi-shortform and divi-placeholders, additions to
  divi-structure, divi-attrs, overview (tool groups, 'nur lesen'), workflows, content-types.
- D7 wording and the S7 exception in readme, guides and spec 1.3/5.2; readme 0.3.0.
- ToolNamingTest: every referenced guide topic exists; overview lists exactly the topics.
- tests/Integration/divi-write-smoke.sh: all write tools via OAuth, editor without
  unfiltered_html with benign probes (S6), Divi's own save filters on the new fixture
  synthetic-divi-filters.html (S7); admin-render.php accepts the new wrap class.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Integration/admin-render.php

@@ -41,6 +41,6 @@ foreach ($lit_page->tabSlugs() as $lit_slug) {
         continue;
     }
 
-    $lit_ok = str_contains($lit_html, 'nav-tab-active') && str_contains($lit_html, 'class="wrap"');
+    $lit_ok = str_contains($lit_html, 'nav-tab-active') && preg_match('/class="wrap[ "]/', $lit_html) === 1;
     echo $lit_slug . ($lit_ok ? ' ok ' : ' FAIL ') . strlen($lit_html) . "\n";
 }