Capture city + LinkedIn on card intake; sharpen the transcription prompt

The card transcription prompt now reads emails/URLs/phones character-by-character,
explicitly forbids autocompleting toward a plausible domain (the mara.com ->
marac.com failure), and emits labeled lines (which also feeds the field extractor
cleaner input).

The extractor gains city + linkedin_url. city is a plain field (low-harm if wrong;
the human sees it on the card). linkedin_url follows the email-integrity rule: kept
only if it literally appears in the source / a revise instruction, never minted -- a
wrong profile URL points at the wrong person. Both flow to the contact via the
existing log-communication upsert (city also syncs to the grid contact pill).

Phone is intentionally NOT included yet: the bot's write path can't store it until a
small server-side change lands (next s9pk). See the matrix-intake guide.

backend/matrix_intake/test_crm_client.py

@@ -15,11 +15,21 @@ def test_new_investor_payload():
     assert out["investor_name"] == "Acme Capital"
     assert out["create_investor_if_missing"] is True
     assert "row_id" not in out
-    assert out["contact"] == {"name": "Jane Doe", "email": "jane@acme.com", "title": "GP"}
+    assert out["contact"] == {"name": "Jane Doe", "email": "jane@acme.com", "title": "GP",
+                              "city": "", "linkedin_url": ""}
     assert out["body"] == "met at conf"
     assert out["source"] == "matrix_intake"
 
 
+def test_contact_carries_city_and_linkedin_when_present():
+    p = {"intent": "new_investor", "investor_name": "Acme Capital", "contact_name": "Jane Doe",
+         "contact_email": "jane@acme.com", "city": "New York",
+         "linkedin_url": "linkedin.com/in/janedoe", "note": "met at conf"}
+    out = crm_client.build_commit_payload(p)
+    assert out["contact"]["city"] == "New York"
+    assert out["contact"]["linkedin_url"] == "linkedin.com/in/janedoe"
+
+
 def test_existing_investor_uses_row_id_not_create():
     p = {"intent": "meeting_note", "investor_name": "Acme Capital",
          "contact_name": "Jane Doe", "contact_email": None, "note": "wants Q3 deck",