Fix mimeType inconsistency in tag resource listings

Co-authored-by: kentcdodds <[email protected]>

Author: Copilot

exercises/03.resources/03.solution.list/src/index.test.ts

@@ -201,7 +201,7 @@ test('Resource List - Tags', async () => {
 			expect.objectContaining({
 				name: expect.any(String),
 				uri: expect.stringMatching(/epicme:\/\/tags\/\d+/),
-				mimeType: 'application/json',
+				mimeType: 'text/plain',
 			}),
 		)
 	})

exercises/03.resources/03.solution.list/src/resources.ts

@@ -33,7 +33,7 @@ export async function initializeResources(agent: EpicMeMCP) {
 					resources: tags.map((tag) => ({
 						name: tag.name,
 						uri: `epicme://tags/${tag.id}`,
-						mimeType: 'application/json',
+						mimeType: 'text/plain',
 					})),
 				}
 			},