render_claim_lattice: drop leading "- " markdown bullet from claim lines

The bullet prefix was a CLI-render convenience but it bleeds into the
answer_text field of the JSON payload — wrong layer. Indented
evidence excerpts under each flush-left claim provide enough visual
structure in plain text; a markdown frontend can re-add bullets if
that view wants them.

71 claim_lattice tests pass.

arborist/qa/evidence.py

@@ -263,7 +263,7 @@ def render_claim_lattice(
         text = (c.get("text") or "").strip()
         if not text:
             continue
-        lines.append(f"- {text}")
+        lines.append(text)
         for eid in c.get("pointer_ids") or c.get("evidence_ids") or []:
             obj = by_id.get(eid)
             if obj is None: