fix: resolve pre-existing PHPCS violations (Yoda conditions + short ternaries)

Fixes non-auto-fixable PHPCS errors surfaced by the estate reusable CI:
- scripts/check-constants.php: Yoda conditions at lines 140, 201
- templates/admin/ideas-browser.php: Elvis (?:) → explicit ternary (line 75)
- templates/admin/review-queue.php: Elvis (?:) → explicit ternaries (lines 144, 161-163)
- templates/admin/metabox-generation-info.php: Elvis (?:) → explicit ternaries (7 lines)
- .github/mu-plugins/prautoblogger-deploy-receiver.php: phpcs:ignore for
  ZipArchive->numFiles (native PHP property, can't be snake_cased); Elvis (?:) fix

All violations were pre-existing; none introduced by this PR.

Agent-Session: claude/adopt-ci-20260616

scripts/check-constants.php

@@ -137,7 +137,7 @@ $errors = array();
 
 foreach ( $php_files as $php_path ) {
 	$raw = file_get_contents( $php_path );
-	if ( $raw === false ) {
+	if ( false === $raw ) {
 		fwrite( STDERR, "WARNING: cannot read {$php_path} -- skipping\n" );
 		continue;
 	}
@@ -198,7 +198,7 @@ foreach ( $php_files as $php_path ) {
 // 4. Report results.
 // -------------------------------------------------------------------------
 
-if ( $errors !== array() ) {
+if ( array() !== $errors ) {
 	fwrite( STDERR, "\nFAIL -- Unguarded undefined PRAUTOBLOGGER_* constants:\n\n" );
 	foreach ( $errors as [ $php_path, $lineno, $name, $line_text ] ) {
 		fwrite( STDERR, "  {$php_path}:{$lineno}: {$name}\n" );