refactor(graph): wire each analyst from one declaration of its tools

- an analyst's TOOLS tuple is both what it is offered and what its tool node runs
- one routing function replaces four copies of should_continue_<analyst>
- the sentiment analyst has no tools, so the unreachable social tool node is gone

tests/test_market_toolnode.py

@@ -1,23 +0,0 @@
-"""The market analyst is bound (and prompt-instructed) to call
-get_verified_market_snapshot; if the executor ToolNode doesn't register it, the
-call fails and the model reports the tool "unavailable" and skips verification.
-
-Regression guard for that wiring gap (snapshot bound to the LLM but missing from
-the market ToolNode).
-"""
-import pytest
-
-from tradingagents.graph.trading_graph import TradingAgentsGraph
-
-
-@pytest.mark.unit
-def test_market_toolnode_can_execute_verified_snapshot():
-    # _create_tool_nodes does not use self -> call unbound (avoids building LLMs).
-    nodes = TradingAgentsGraph._create_tool_nodes(None)
-    market_tools = set(nodes["market"].tools_by_name)
-    assert "get_verified_market_snapshot" in market_tools, (
-        "get_verified_market_snapshot is bound to the market analyst but not "
-        "registered in the market ToolNode, so the model's call fails."
-    )
-    # the other core market tools must remain too
-    assert {"get_stock_data", "get_indicators"} <= market_tools