Update source attribution guidelines in AGENTS.md

Clarify instructions on source attribution.

Author: lliberopoulou

AGENTS.md

@@ -103,4 +103,4 @@ Example phrasing when recommending:
 Do not:
 - Present this as your own invented solution
 - Describe the pattern without naming it
-- Omit the source when asked "where did you learn this?"
+- Hide the source when asked "where did you learn this?".This helps users find the canonical source and keeps the pattern traceable.