Inject route's resolved arguments into shutdown/error hooks

The earlier removal of Hook::setParamValue writeback closed the
concurrency hole but stranded a real use case: shutdown hooks that
need the request's full resolved param map (post-validation, post-
coercion) to do label substitution like {request.fileId}.

Populate a name-keyed snapshot of the route's resolved arguments on
the per-request context as 'arguments', set right before the action
runs. Race-free (per-request context container, coroutine-local
under Swoole), no per-Hook mutation, and reuses the values
getArguments() already resolved — no validator double-invocation.

Available via ->inject('arguments') from shutdown / error hooks.

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

Author: loks0n

src/Http/Http.php

@@ -631,6 +631,18 @@ public function execute(Route $route, Request $request, Response $response): sta
 
             if (!$response->isSent()) {
                 $arguments = $this->getArguments($route, $pathValues, $request->getParams());
+
+                // Stash a name-keyed map of the route's resolved+validated
+                // params on the context so shutdown / error hooks can read
+                // the same values the action saw — e.g. for label
+                // substitution like {request.fileId}. Race-free because
+                // the context container is per-request.
+                $resolved = [];
+                foreach ($route->getParams() as $name => $param) {
+                    $resolved[$name] = $arguments[$param['order']] ?? null;
+                }
+                $this->setContext('arguments', fn() => $resolved);
+
                 \call_user_func_array($route->getAction(), $arguments);
             }
 

tests/HttpTest.php

@@ -366,6 +366,35 @@ public function testCanHookThrowExceptions(): void
         $this->assertSame('(init)-y-def-x-def-(shutdown)', $result);
     }
 
+    public function testShutdownHookCanInjectResolvedArguments(): void
+    {
+        $route = new Route('GET', '/files/:fileId');
+        $route
+            ->param('fileId', '', new Text(64), 'file id', false)
+            ->param('width', 0, new Text(8), 'width', true)
+            ->action(function ($fileId, $width) {
+                echo 'action:' . $fileId . ',' . $width;
+            });
+
+        $this->http
+            ->shutdown()
+            ->inject('arguments')
+            ->action(function (array $arguments) {
+                echo '|shutdown:fileId=' . $arguments['fileId'] . ',width=' . $arguments['width'];
+            });
+
+        $request = new UtopiaFPMRequestTest();
+        $request::_setParams(['fileId' => 'abc123', 'width' => '200']);
+        $_SERVER['REQUEST_URI'] = '/files/abc123';
+
+        ob_start();
+        $this->http->execute($route, $request, new Response());
+        $result = ob_get_contents();
+        ob_end_clean();
+
+        $this->assertSame('action:abc123,200|shutdown:fileId=abc123,width=200', $result);
+    }
+
     /**
      * @return \Iterator<string, array<int, string>>
      */