refactor: SentryEventScrubber static + config array notation

The scrubber is fully stateless. Container-resolution per event was
overhead without value, the closure indirection polluted the config
layer with executable logic, and stack traces showed an anonymous
closure frame instead of the class name.

- SentryEventScrubber::scrub() and its private helpers all become
  static methods. No instance fields, so the change is mechanical.
- config/sentry.php before_send switches from a closure that calls
  app() to PHP array-callable notation [Class, method]. Symfony
  OptionsResolver accepts array-callables for static methods.
- PiiScrubbingTest swaps (new SentryEventScrubber)->scrub(...) for
  SentryEventScrubber::scrub(...). Semantics unchanged.

Tests 1537 unchanged. Larastan and Pint clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

api/config/sentry.php

@@ -25,8 +25,12 @@ return [
     // When left empty or `null` the Laravel environment will be used (usually discovered from `APP_ENV` in your `.env`)
     'environment' => env('SENTRY_ENVIRONMENT', env('APP_ENV')),
 
-    // Crewli observability scrubber (RFC-WS-7 §3.7).
-    'before_send' => static fn (\Sentry\Event $event, ?\Sentry\EventHint $hint = null): ?\Sentry\Event => app(\App\Services\Observability\SentryEventScrubber::class)->scrub($event, $hint),
+    // RFC-WS-7 §3.7 — stateless static method + array notation.
+    // Configuration is declarative (a reference, not executable logic);
+    // container-resolution per event would be overhead without value for
+    // stateless scrubbing, and stack traces show the class name instead of
+    // an anonymous closure frame.
+    'before_send' => [\App\Services\Observability\SentryEventScrubber::class, 'scrub'],
 
     // Errors-only — RFC §2 amendment B explicitly excludes performance tracing.
     // Force traces/profiles off regardless of env.