feat: add Steam ID redaction pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Util/ProjectZomboid/ProjectZomboidRedactor.php

@@ -24,6 +24,12 @@ use IndifferentKetchup\Codex\Util\RedactorInterface;
  */
 class ProjectZomboidRedactor implements RedactorInterface
 {
+    /** Regex matching a 17-digit SteamID64 anchored on the 76561198 universe prefix, with lookaround boundaries that reject embedded occurrences. */
+    public const string STEAM_ID_REGEX = '/(?<![A-Za-z0-9])76561198\d{9}(?![A-Za-z0-9])/u';
+
+    /** Zeroed-out SteamID64 placeholder; syntactically valid but refers to no real account. */
+    public const string STEAM_ID_REPLACEMENT = '76561198000000000';
+
     private bool $redactSteamIds = true;
     private bool $redactPlayerNames = true;
     private bool $redactCoordinates = true;
@@ -76,7 +82,7 @@ class ProjectZomboidRedactor implements RedactorInterface
     public function redact(string $content): string
     {
         if ($this->redactSteamIds) {
-            // Steam ID pass added in Task 2
+            $content = preg_replace(self::STEAM_ID_REGEX, self::STEAM_ID_REPLACEMENT, $content);
         }
         if ($this->redactPlayerNames) {
             // Player name pass added in Task 3