test(playwriter): clarify test names

Rename MCP-prefixed test files and top-level describe labels to reflect relay, extension, and snapshot scopes.

playwriter/src/extension-connection.test.ts

@@ -7,7 +7,7 @@ import './test-declarations.js'
 
 const TEST_PORT = 19990
 
-describe('MCP Connection Tests', () => {
+describe('Extension Connection Tests', () => {
     let client: Awaited<ReturnType<typeof createMCPClient>>['client']
     let cleanup: (() => Promise<void>) | null = null
     let testCtx: TestContext | null = null

playwriter/src/relay-core.test.ts

@@ -7,7 +7,7 @@ import './test-declarations.js'
 
 const TEST_PORT = 19987
 
-describe('MCP Core Tests', () => {
+describe('Relay Core Tests', () => {
     let client: Awaited<ReturnType<typeof createMCPClient>>['client']
     let cleanup: (() => Promise<void>) | null = null
     let testCtx: TestContext | null = null

playwriter/src/relay-navigation.test.ts

@@ -6,7 +6,7 @@ import './test-declarations.js'
 
 const TEST_PORT = 19992
 
-describe('MCP Navigation Tests', () => {
+describe('Relay Navigation Tests', () => {
     let testCtx: TestContext | null = null
 
     beforeAll(async () => {

playwriter/src/snapshot-tools.test.ts

@@ -14,7 +14,7 @@ import './test-declarations.js'
 
 const TEST_PORT = 19991
 
-describe('MCP Snapshot & Screenshot Tests', () => {
+describe('Snapshot & Screenshot Tests', () => {
     let client: Awaited<ReturnType<typeof createMCPClient>>['client']
     let cleanup: (() => Promise<void>) | null = null
     let testCtx: TestContext | null = null