v1.15.2 — add Claude CLI status line, Zed support, rename 3b-review to review

- Status line: new src/statusline-claude/ (Planny box-star mascot icon),
  install/uninstall wiring in install.js, Install All (A) + Custom (S)
- Zed agent support across README, AGENTS, docs, init prompt, installer
- Rename /plan2code-3b-review to /plan2code-review (now a standalone
  utility workflow); update file, reference dir, and all cross-references
- install.js: fs.rmSync simplifications, async install, summary cleanup
- Bump to v1.15.2; CHANGELOG entries for v1.15.0/1/2

docs/index.html

@@ -988,7 +988,7 @@
     <section class="step">
         <div class="step-content">
             <div class="step-header">
-                <div class="step-number headline">3b</div>
+                <div class="step-number headline">review</div>
                 <div class="step-icon" style="color: var(--accent);">🔬</div>
             </div>
             <h2 class="step-title subheadline">Review</h2>
@@ -1112,7 +1112,7 @@
                         <li><span class="code-line">/plan2code-1-plan</span></li>
                         <li><span class="code-line">/plan2code-2-document</span></li>
                         <li><span class="code-line">/plan2code-3-implement</span> <span class="gray">(per phase)</span></li>
-                        <li><span class="code-line">/plan2code-3b-review</span> <span class="gray">(optional)</span></li>
+                        <li><span class="code-line">/plan2code-review</span> <span class="gray">(optional)</span></li>
                         <li><span class="code-line">/plan2code-4-finalize</span></li>
                     </ul>
                     <br>