refactor: manifest_read.php uses manifest.xml as primary lookup

Priority order: manifest.xml > .manifest.xml (legacy) > .moko-platform (v4)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cli/manifest_read.php

@@ -47,11 +47,11 @@ foreach ($argv as $i => $arg) {
 $root = realpath($path) ?: $path;
 $manifestFile = null;
 
-// Priority: .manifest.xml > .moko-platform (backward compat)
+// Priority: manifest.xml (current standard)
 $candidates = [
-    "{$root}/.mokogitea/.manifest.xml",
-    "{$root}/.mokogitea/.moko-platform",
-    "{$root}/.mokogitea/.mokostandards",      // legacy v4
+    "{$root}/.mokogitea/manifest.xml",
+    "{$root}/.mokogitea/.manifest.xml",    // legacy (dot-prefixed)
+    "{$root}/.mokogitea/.moko-platform",  // legacy v4
 ];
 
 foreach ($candidates as $candidate) {