[Examples] Demo pre-built instance handlers + inspector coverage (#390)

* [Tests] Bump MCP Inspector to 0.22.0 for 2025-11-25 protocol

The pinned inspector 0.17.2 predates the protocol version bump to
2025-11-25 (v0.6.0) and rejects the handshake with "Server's protocol
version is not supported", failing every inspector snapshot test. 0.22.0
negotiates the current protocol; the full inspector suite passes against
it (95 tests, 7 pre-existing skips).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [Examples] Demo pre-built instance handler in combined-registration

Extends the combined-registration example with a third handler style:
a pre-built object instance `[$instance, 'method']`, alongside the
existing discovered and manual class-string handlers. PreconfiguredGreeter
takes a scalar constructor argument neither the container-less
`new $className()` fallback nor the auto-wiring container can build, so it
can only be registered as an already-constructed instance — exercising the
resolver path added in the parent branch.

Adds an inspector snapshot case (tools/call instance_greeter) and updates
the tools/list snapshot.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

examples/server/combined-registration/PreconfiguredGreeter.php

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\Server\CombinedRegistration;
+
+use Psr\Log\LoggerInterface;
+
+/**
+ * A handler whose constructor takes a scalar the container cannot auto-wire, so
+ * it can only be registered as a pre-built object instance:
+ * `->addTool([new PreconfiguredGreeter('...', ...), 'greet'], 'instance_greeter')`.
+ *
+ * Neither the container-less `new $className()` fallback nor the auto-wiring
+ * container can build this class, since the required `string $greeting` has no
+ * default and is not a resolvable service.
+ */
+final class PreconfiguredGreeter
+{
+    public function __construct(
+        private readonly string $greeting,
+        private readonly LoggerInterface $logger,
+    ) {
+    }
+
+    /**
+     * A tool registered as a pre-built object instance.
+     *
+     * @param string $name the name to greet
+     *
+     * @return string greeting
+     */
+    public function greet(string $name): string
+    {
+        $this->logger->info("Instance tool 'instance_greeter' called for {$name}");
+
+        return "{$this->greeting}, {$name}!";
+    }
+}

examples/server/combined-registration/server.php

@@ -14,9 +14,15 @@ require_once dirname(__DIR__).'/bootstrap.php';
 chdir(__DIR__);
 
 use Mcp\Example\Server\CombinedRegistration\ManualHandlers;
+use Mcp\Example\Server\CombinedRegistration\PreconfiguredGreeter;
 use Mcp\Server;
 use Mcp\Server\Session\FileSessionStore;
 
+// Built here so its constructor dependencies (a scalar the container cannot
+// auto-wire) are injected before registration; the SDK invokes this very
+// instance instead of trying to construct one itself.
+$preconfiguredGreeter = new PreconfiguredGreeter('Willkommen', logger());
+
 $server = Server::builder()
     ->setServerInfo('Combined HTTP Server', '1.0.0')
     ->setLogger(logger())
@@ -24,6 +30,7 @@ $server = Server::builder()
     ->setSession(new FileSessionStore(__DIR__.'/sessions'))
     ->setDiscovery(__DIR__)
     ->addTool([ManualHandlers::class, 'manualGreeter'])
+    ->addTool([$preconfiguredGreeter, 'greet'], 'instance_greeter')
     ->addResource(
         [ManualHandlers::class, 'getPriorityConfigManual'],
         'config://priority',