refactor: console improvements — auto-discovery, centralized bootstrap, per-command help

- ConsoleApplication.discoverCommands() scans lib/Console/Commands/ automatically;
  adding a new command no longer requires editing bin/console
- Command base class provides bootstrapApp(), bootstrapModuleApp(), requireBinScript()
  and projectRoot() helpers — eliminates fragile 4-level relative require_once paths
- Per-command --help support via optional usage() method on Command
- Docker-compose scheduler updated to use bin/console scheduler:run
- Old bin scripts now emit deprecation hint to stderr when called directly

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

lib/Console/Commands/DoctorCommand.php

@@ -18,11 +18,9 @@ final class DoctorCommand extends Command
 
     public function execute(array $args, array $options): int
     {
-        // doctor.php is self-contained — include and let it run
-        $scriptPath = __DIR__ . '/../../../bin/doctor.php';
-
-        // Capture the exit code by running as a subprocess to avoid
-        // the script's own exit() call terminating our process.
+        // doctor.php calls exit() internally — run as subprocess
+        // to avoid terminating the console process.
+        $scriptPath = $this->projectRoot() . '/bin/doctor.php';
         $command = PHP_BINARY . ' ' . escapeshellarg($scriptPath);
         passthru($command, $exitCode);