chore: add .archive/ to gitignore

Jing-yilin · Jing-yilin · commit f3b01e511c3b · 2026-04-17T16:56:06.000+08:00
diff --git a/.gitignore b/.gitignore
@@ -75,3 +75,6 @@ PLAN.md
 PACKAGE_PLAN.md
 SESSIONS.md
 PACKAGE_PLAN.md
+
+# archive (local-only session knowledge)
+.archive/
