Add support for wp_robots hook

[Copilot]

The plugin was manually echoing a <meta name="robots"> tag via wp_head, bypassing WordPress's native robots directive system introduced in WP 5.7.

Changes

• filterRobots — New method hooked into wp_robots filter; adds noindex/nofollow directives to the robots array when _hide_from_search_engines meta is set
• shouldHideFromSearchEngines — Extracted shared condition logic (admin check, blog_public option, valid post ID, meta value) into a protected helper used by both filterRobots and hideFromSearchEngines; adds safety guard for falsy get_the_ID() return
• setUpHooks — Registers wp_robots filter on WP 5.7+ (detected via function_exists('wp_robots')); falls back to the legacy wp_head echo for older versions

// WP 5.7+: directives merged into WP's robots meta tag
add_filter( 'wp_robots', array( __CLASS__, 'filterRobots' ) );

// Older WP: manual meta tag echo preserved
add_action( 'wp_head', array( __CLASS__, 'hideFromSearchEngines' ), 5 );

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add support for wp_robots hook</issue_title>
<issue_description>https://developer.wordpress.org/reference/hooks/wp_robots/</issue_description>

Comments on the Issue (you are @copilot in this section)

@wpscholar Add logic to this function to utilize the wp_robots hook: https://github.com/wpscholar-wp-plugins/mpress-hide-from-search/blob/master/includes/Plugin.php#L67-L77

• Fixes Add support for wp_robots hook #8

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