Matrix intake: frame parse with team roster so a teammate isn't read as the prospect

Local-smoke found "jonathan is chatting with wyoming" extracted the teammate, not
the prospect. Feed the parser an optional team roster (INTAKE_TEAM_ROSTER) via a
build_system(roster) outreach frame: roster names/initials are the people doing
outreach and are never extracted; the other party is the investor/prospect. Same
framing on the revise leg. Unset roster = prior behavior.

backend/matrix_intake/test_parse.py

@@ -152,6 +152,49 @@ def test_revise_preserves_match_id():
     assert revised["intent"] == "meeting_note"
 
 
+def test_build_system_appends_roster_frame_only_when_roster_given():
+    base = parse.build_system()
+    assert base.strip().endswith("Output JSON only.")
+    assert "doing the outreach" not in base  # no roster → no outreach frame
+
+    framed = parse.build_system(["Grant", "Jonathan", "Marty"])
+    assert "Grant" in framed and "Jonathan" in framed and "Marty" in framed
+    assert "doing the outreach" in framed  # the outreach frame is present
+    assert framed.strip().endswith("Output JSON only.")  # JSON-only stays last for recency
+
+
+def test_parse_message_injects_roster_into_system_prompt():
+    # Capture the system prompt the model is handed, and confirm the teammate ("jonathan")
+    # is framed as outreach while the prospect ("wyoming") is what gets extracted.
+    seen = {}
+
+    def cap(text, system=None, max_tokens=400):
+        seen["system"] = system
+        return {"intent": "meeting_note", "investor_name": "Wyoming", "contact_name": None,
+                "note": "jonathan chatting with them"}
+
+    p = parse.parse_message("jonathan is chatting with wyoming", parse_fn=cap,
+                            roster=["Grant", "Jonathan", "Marty"])
+    assert "Jonathan" in seen["system"]
+    assert "doing the outreach" in seen["system"]
+    assert p["investor_name"] == "Wyoming"
+
+
+def test_revise_injects_roster_into_system_prompt():
+    proposal = {"intent": "meeting_note", "investor_name": "Wyoming", "contact_name": None,
+                "contact_email": None, "contact_title": None, "note": "x",
+                "_source_text": "jonathan is chatting with wyoming"}
+    seen = {}
+
+    def cap(prompt, system=None, max_tokens=400):
+        seen["system"] = system
+        return {"note": "sent the deck"}
+
+    parse.revise(proposal, "note: sent the deck", parse_fn=cap, roster=["Grant", "Jonathan"])
+    assert "Jonathan" in seen["system"]
+    assert "doing the outreach" in seen["system"]
+
+
 def test_revise_cannot_empty_the_proposal():
     proposal = {"intent": "new_investor", "investor_name": "Acme", "contact_name": "Jane",
                 "contact_email": None, "contact_title": None, "note": "x", "_source_text": "Acme Jane"}