[eric] browser: playbook distill also captures perception traps, not just mechanics

backend/apps/agents/browser/browser_playbook.py

@@ -210,6 +210,10 @@ def _build_prompt(host: str, task: str, working_memory: str, summary: str,
         "- ALWAYS keep interaction mechanics that cost the agent a retry, e.g. "
         "'Enter inserts a newline in the message composer; click the Send button "
         "instead' or 'the filter opens a dropdown, not a new page'.\n"
+        "- ALWAYS keep PERCEPTION TRAPS: something that LOOKED wrong or ambiguous "
+        "but was actually fine, so the next agent is not fooled into a detour, e.g. "
+        "'a 1:1 chat is titled \"<Other> and <You>\"; that IS the direct thread, do "
+        "not try to start a new one'.\n"
         "- DROP anything specific to THIS task's data (names, the actual answer), "
         "one-offs, secrets, or obvious facts.\n"
         "- MERGE duplicates; if a new lesson CONTRADICTS an old bullet, keep the "