[eric] memory: the profile is about the person, not the project, and saying nothing is the default

backend/apps/memory/distill.py

@@ -56,15 +56,33 @@ async def distill_session_memory(session: AgentSession) -> List[str]:
         p_last_distilled[session.id] = p_user_message_count(session)
         aux_model = (await resolve_aux_model(global_settings, preferred_tier="haiku"))[0]
         client = get_anthropic_client_for_model(global_settings, aux_model)
+        # Deliberately harsh. The permissive version filled a real user's memory with task summaries
+        # ("works on an app with Slack OAuth, fullscreen modes, pinch-to-zoom") and topic echoes
+        # ("interested in AI agents") that were just the last thing they happened to ask about. Saying
+        # NOTHING costs nothing; a junk fact is paid for on every turn of every chat, forever.
         system_prompt = (
-            "You extract durable facts about the USER from a conversation with their AI agent: "
-            "who they are, what they work on, standing preferences, constraints they stated. "
-            "Facts must be about the user themselves and still true next month; never task details, "
-            "never one-off requests, never anything the ASSISTANT said, never secrets, keys, or "
-            "passwords. Write each fact self-contained in third person, under 200 characters "
-            '(e.g. "Prefers concise answers with real measured numbers").\n\n'
+            "You maintain a small, permanent profile of the USER as a PERSON. It is read on every "
+            "turn of every future conversation, so a wrong or trivial entry is expensive and a "
+            "missing one costs nothing. Default to NOTHING.\n\n"
+            "SAVE only a fact that passes ALL FIVE:\n"
+            "1. It is about the person: who they are, their role, their tools and languages, how "
+            "they want to be worked with, a constraint or standing rule they set.\n"
+            "2. They stated or clearly demonstrated it about THEMSELVES. Never infer a trait from "
+            "the fact that they asked about a topic once.\n"
+            "3. It is still true in six months, whatever they happen to be working on then.\n"
+            "4. It changes how an assistant should behave in an UNRELATED future conversation.\n"
+            "5. It is not already obvious from whatever they are working on at the time.\n\n"
+            "NEVER save: what they are building or its features; anything about the current task, "
+            "bug, file, or request; a topic they asked about; anything the ASSISTANT said, did, or "
+            "suggested; anything time-bound; secrets, keys, tokens, or passwords.\n\n"
+            'GOOD: "Prefers answers with real measured numbers over estimates" - '
+            '"Works solo and ships releases himself" - "Writes TypeScript and Python".\n'
+            'BAD: "Works on an app with Slack OAuth and pinch-to-zoom" (that is the project, not '
+            'the person) - "Interested in AI agents and LLM tooling" (that is just the topic they '
+            'raised) - "Wants a weekly news digest" (that is a request they made).\n\n'
+            "Write each fact self-contained, third person, under 200 characters.\n"
             f"Return at most {MAX_FACTS_PER_DISTILL} facts, one per line, no numbering, no quotes. "
-            "If the conversation reveals nothing durable, return the single word NOTHING."
+            "Most conversations should yield none: if in any doubt, return the single word NOTHING."
         )
         # Show it what is already known. Without this the model re-derives facts it recorded weeks
         # ago, phrased differently every time, and the store's token-overlap guard cannot catch a