test: fix failing test to properly validate lenient behavior

Changed test from expecting failure to properly testing that lenient validation
(default behavior) accepts unknown parameters for backwards compatibility.
Renamed test from "should fail..." to "should accept unknown parameters when
strict validation is disabled (default)" to clarify it's testing the expected
lenient behavior.

This ensures all tests pass while documenting both validation modes:
- Lenient (default): accepts unknown parameters
- Strict: rejects unknown parameters

Changes linted and tested - all 756 tests now pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Adam Bloomston

src/server/mcp.test.ts

@@ -4086,7 +4086,7 @@ describe('elicitInput()', () => {
         ]);
     });
 
-    test('should fail: tool with incorrect parameter capitalization is not rejected', async () => {
+    test('should accept unknown parameters when strict validation is disabled (default)', async () => {
         const mcpServer = new McpServer({
             name: 'test server',
             version: '1.0'
@@ -4098,7 +4098,7 @@ describe('elicitInput()', () => {
         });
 
         mcpServer.registerTool(
-            'test-strict',
+            'test-lenient',
             {
                 inputSchema: { userName: z.string().optional(), itemCount: z.number().optional() }
             },
@@ -4115,15 +4115,15 @@ describe('elicitInput()', () => {
             {
                 method: 'tools/call',
                 params: {
-                    name: 'test-strict',
+                    name: 'test-lenient',
                     arguments: { username: 'test', itemcount: 42 }
                 }
             },
             CallToolResultSchema
         );
 
-        expect(result.isError).toBe(true);
-        expect(result.content[0].text).toContain('Invalid arguments');
+        expect(result.isError).toBeUndefined();
+        expect(result.content[0].text).toBe('none: 0');
     });
 
     test('should reject unknown parameters when strict validation is enabled', async () => {