fix: close etappe-0 whole-branch review findings

- Autoloader: add automattic/jetpack-autoloader and load
  vendor/autoload_packages.php; require wordpress/mcp-adapter directly (^0.5).
- ServerRegistrar: make the adapter create_server() call and the
  OAuthServerRegistrar class_exists() check injectable so createServer()'s
  unhook-before-create ordering and the "mcp-oauth absent" branch are unit
  tested; add a smoke-test check that booting REST triggers no
  _doing_it_wrong().
- mcp-smoke.sh: assert mcp-adapter's default server route 404s, and that the
  subscriber role-gate denial actually carries our/the adapter's denial text
  (not just any isError/error).
- Guard tests/Integration/mint-token.php and tec-probe.php with
  `defined('WP_CLI') && WP_CLI || exit;`; add .gitattributes export-ignore
  for tests/docs-superpowers/.superpowers/phpunit/phpcs config.
- Security: add Server/RequestContext, tracking via
  rest_request_before_callbacks whether the current REST dispatch is our
  OAuth-protected /mcp/mcp-oauth-server route; AbilityRegistrar's
  permission_callback now denies (after the role gate) when abilities are
  invoked outside that route. Wired in Plugin::boot().
- Minors: single Plugin::VERSION constant used by ServerRegistrar;
  IntegrationRegistry caches its computed abilities list; tec-probe.php
  checks wp_insert_post's result and cleans up its probe post in a
  try/finally.

composer test: 47/47 green. composer lint: clean. Full mcp-smoke.sh run ends
ALL CHECKS PASSED (plus the expected /.well-known WARN).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Abilities/AbilityRegistrar.php

@@ -6,6 +6,7 @@ namespace LIT\MCP\Abilities;
 
 use LIT\MCP\Access;
 use LIT\MCP\Integrations\IntegrationRegistry;
+use LIT\MCP\Server\RequestContext;
 use Throwable;
 use WP_Error;
 
@@ -55,6 +56,10 @@ final class AbilityRegistrar
                     return Errors::forbidden('Dein Benutzerkonto ist für LIT MCP nicht freigegeben.');
                 }
 
+                if (! RequestContext::isOAuthServerRequest()) {
+                    return Errors::forbidden('LIT MCP ist nur über den OAuth-geschützten MCP-Server nutzbar.');
+                }
+
                 return $ability->permission(is_array($input) ? $input : []);
             },
             'execute_callback' => static function (mixed $input = null) use ($ability): mixed {