fix(mcp): classify compound routines as ddl

[Stiwar0098]

Closes #384

Summary

• Classifies compound MySQL/MariaDB \CREATE PROCEDURE\, \CREATE FUNCTION\, \CREATE TRIGGER\, and \CREATE EVENT\ statements as \ddl\ in MCP activity.
• Keeps obvious trailing payloads after routine bodies fail-closed as \unknown\.
• Adds regression coverage for routine classification and local \.opencode/\ ignore handling.

Review notes

• GitNexus affected-scope check: low risk, 0 affected processes.
• Fresh reliability review: no PR-opening blockers; warning remains for nested compound blocks being potentially classified as \unknown\.

Test plan

• Not run: maintainer explicitly requested not to run a build.