test(integration): add integration test suite, .env.example, and README

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-Claude)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

.env.example

@@ -0,0 +1,16 @@
+# Sage X3 Connection (REQUIRED)
+SAGE_X3_URL=http://your-x3-server:8124
+SAGE_X3_USER=your_webservice_user
+SAGE_X3_PASSWORD=your_password
+SAGE_X3_ENDPOINT=X3V12
+
+# Sage X3 SOAP Settings (OPTIONAL)
+SAGE_X3_POOL_ALIAS=SEED
+SAGE_X3_LANGUAGE=ENG
+
+# MCP Transport (OPTIONAL)
+MCP_TRANSPORT=stdio
+MCP_HTTP_PORT=3000
+
+# TLS (OPTIONAL — set to false for self-signed certificates)
+SAGE_X3_REJECT_UNAUTHORIZED=true