chore: add test database directories to gitignore (#67)

Co-authored-by: Developer <dev@local>

Author: tryweb

.gitignore

@@ -11,5 +11,8 @@ npm-debug.log*
 !.opencode/skills/
 !.opencode/skills/**
 
+# Test databases (LanceDB test artifacts)
+test/.test-db-*/
+
 # Agent guidelines (local development instructions for AI agents)
 AGENT.md