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

tests/Unit/Server/RequestContextTest.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Server;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Server\RequestContext;
+use LIT\MCP\Tests\Unit\TestCase;
+use WP_REST_Request;
+
+final class RequestContextTest extends TestCase
+{
+    protected function tearDown(): void
+    {
+        RequestContext::reset();
+        parent::tearDown();
+    }
+
+    public function testIsOAuthServerRequestIsFalseByDefault(): void
+    {
+        self::assertFalse(RequestContext::isOAuthServerRequest());
+    }
+
+    public function testRecordRouteMarksTheOAuthServerRoute(): void
+    {
+        $request = new WP_REST_Request('/mcp/mcp-oauth-server');
+
+        RequestContext::recordRoute(null, [], $request);
+
+        self::assertTrue(RequestContext::isOAuthServerRequest());
+    }
+
+    public function testRecordRouteIgnoresOtherRoutes(): void
+    {
+        $request = new WP_REST_Request('/wp/v2/users/me');
+
+        RequestContext::recordRoute(null, [], $request);
+
+        self::assertFalse(RequestContext::isOAuthServerRequest());
+    }
+
+    public function testRecordRouteReturnsResponseUnchanged(): void
+    {
+        $response = new \stdClass();
+        $request = new WP_REST_Request('/mcp/mcp-oauth-server');
+
+        $result = RequestContext::recordRoute($response, [], $request);
+
+        self::assertSame($response, $result);
+    }
+
+    public function testRegisterHooksRecordRouteOnRestRequestBeforeCallbacks(): void
+    {
+        Functions\expect('add_filter')
+            ->once()
+            ->with('rest_request_before_callbacks', [RequestContext::class, 'recordRoute'], 10, 3);
+
+        (new RequestContext())->register();
+    }
+}