fix: delete redundant datamachine_check_requirements() (#1919) (#1924)

The plugin header already declares every requirement the custom function
checked:

  Requires at least: 7.0
  Requires PHP:     8.2
  Requires Plugins: agents-api

WordPress core (6.5+ for `Requires at least`/`Requires PHP`, 6.6+ for
`Requires Plugins`) reads these headers and:

* Refuses to activate the plugin if WP or PHP is below the minimum.
* Refuses to activate if `agents-api` is missing.
* Surfaces user-friendly admin notices on the plugins screen.
* Compares versions via `is_wp_version_compatible()` /
  `is_php_version_compatible()`, the canonical contract for "does this
  version satisfy the requirement."

`datamachine_check_requirements()` reimplemented a strict subset of this
with worse behavior:

* Naive `version_compare( $wp, '7.0', '<' )` rejected WP 7.0 RC nightlies
  because PHP treats `7.0-RC3` as < `7.0` (RC sorts before final). This
  was the bug that motivated #1919 — DM 0.107.0 silently no-op'd on every
  WP 7.0 RC site, no fatal, no frontend-visible signal, and no CLI
  commands registered.
* The vendor/autoload.php existence check was redundant — if the file is
  missing, the next `require_once` at line 26 fatals immediately, which
  is a louder, better signal to the developer than a buried admin notice.
* The admin_notices callbacks only fired in `wp-admin`, so frontend
  operators never saw the failure mode.

Delete the function and the early-return guard. Trust the plugin header.

Removed:
* Lines 21-23: `if ( ! datamachine_check_requirements() ) { return; }`
* Lines 829-861: the `datamachine_check_requirements()` function

Net: -39 lines, no functional regressions on any supported WP/PHP version.

Closes #1919

Co-authored-by: homeboy-ci[bot] <266378653+homeboy-ci[bot]@users.noreply.github.com>

Author: chubes4

data-machine.php

@@ -18,10 +18,6 @@
 	die;
 }
 
-if ( ! datamachine_check_requirements() ) {
-	return;
-}
-
 define( 'DATAMACHINE_VERSION', '0.107.0' );
 
 define( 'DATAMACHINE_PATH', plugin_dir_path( __FILE__ ) );
@@ -824,38 +820,3 @@ function datamachine_on_new_site( \WP_Site $new_site ) {
 
 // Migrations, scaffolding, and activation helpers.
 require_once __DIR__ . '/inc/migrations/load.php';
-
-
-function datamachine_check_requirements() {
-	global $wp_version;
-	$current_wp_version = $wp_version ?? '';
-	if ( '' !== $current_wp_version && ! wp_installing() && version_compare( $current_wp_version, '7.0', '<' ) ) {
-		add_action(
-			'admin_notices',
-			function () use ( $current_wp_version ) {
-				echo '<div class="notice notice-error"><p>';
-				printf(
-					esc_html( 'Data Machine requires WordPress %2$s or higher. You are running WordPress %1$s.' ),
-					esc_html( $current_wp_version ),
-					'7.0'
-				);
-				echo '</p></div>';
-			}
-		);
-		return false;
-	}
-
-	if ( ! file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
-		add_action(
-			'admin_notices',
-			function () {
-				echo '<div class="notice notice-error"><p>';
-				echo esc_html( 'Data Machine: Composer dependencies are missing. Please run "composer install" or contact Chubes to report a bug.' );
-				echo '</p></div>';
-			}
-		);
-		return false;
-	}
-
-	return true;
-}