fix(agents): ground the Trader in the technical market report

- the Trader received only the digested investment plan, so its entry / stop /
  sizing levels were not anchored to real price structure (ATR, support and
  resistance, current price)
- inject the market report and instruct the Trader to take concrete price levels
  from it and direction/strategy from the plan; when the market analyst was not
  selected the report is empty, so the section and grounding note are omitted #1167

tests/test_structured_agent_prompts.py

@@ -52,6 +52,7 @@ def test_trader_prompt_states_constraint():
     create_trader(llm)({
         "company_of_interest": "NVDA",
         "investment_plan": "**Recommendation**: Buy",
+        "market_report": "Current price $189.5; ATR 4.2.",
     })
     assert NO_EXTERNAL_TOOLS in _prompt_text(captured["prompt"])