fix: use node --import tsx for E2E stub servers (Node 20 compat)

--experimental-strip-types requires Node 22.6+, but CI runs Node 20.
The stub server process died immediately with "bad option", causing
MCP handshake failures and TC-PL-002 to fail.

Signed-off-by: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

tests/e2e/mocks/mock-bundle-api/fixtures.ts

@@ -108,7 +108,7 @@ const TEST_SERVERS: ServerDefinition[] = [
     transport: {
       type: 'stdio',
       command: 'node',
-      args: ['--experimental-strip-types', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
+      args: ['--import', 'tsx', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
       env: {},
       metadata: {
         inputs: [],
@@ -148,7 +148,7 @@ const TEST_SERVERS: ServerDefinition[] = [
     transport: {
       type: 'stdio',
       command: 'node',
-      args: ['--experimental-strip-types', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts', '${input:DIRECTORY}'],
+      args: ['--import', 'tsx', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts', '${input:DIRECTORY}'],
       env: {},
       metadata: {
         inputs: [
@@ -195,7 +195,7 @@ const TEST_SERVERS: ServerDefinition[] = [
     transport: {
       type: 'stdio',
       command: 'node',
-      args: ['--experimental-strip-types', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
+      args: ['--import', 'tsx', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
       env: {
         DATABASE_URL: '${input:DATABASE_URL}',
       },
@@ -316,7 +316,7 @@ const TEST_SERVERS: ServerDefinition[] = [
     transport: {
       type: 'stdio',
       command: 'node',
-      args: ['--experimental-strip-types', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
+      args: ['--import', 'tsx', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
       env: {},
       metadata: {
         inputs: [],
@@ -424,7 +424,7 @@ const TEST_SERVERS: ServerDefinition[] = [
     transport: {
       type: 'stdio',
       command: 'node',
-      args: ['--experimental-strip-types', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
+      args: ['--import', 'tsx', 'tests/e2e/mocks/stub-mcp-server/stdio-server.ts'],
       env: {},
       metadata: {
         inputs: [],