fix(cli): honor env precedence for LLM and run config

Interactive selections and flag defaults overrode TRADINGAGENTS_* env vars.
Rule: an explicit env value or CLI flag wins; otherwise the env-applied
default is kept.

- Research depth: skip the prompt when both round-count env vars are set, and
  stop overwriting them (#977).
- Checkpoint: --checkpoint/--no-checkpoint is tri-state; omitting it keeps
  TRADINGAGENTS_CHECKPOINT_ENABLED (#976).
- Docker ollama: use TRADINGAGENTS_LLM_PROVIDER + OLLAMA_BASE_URL, not a bare
  LLM_PROVIDER the overlay never reads (#975).
- Reasoning/thinking knobs: settable via env; the prompt is skipped when set.
- Effort gating: forward effort only to models that accept it (Anthropic
  Opus 4.5+/Sonnet 4.6+, OpenAI reasoning models); drop it elsewhere.
- Boolean env values: raise a named error on invalid input instead of
  silently becoming False.

tests/test_env_overrides.py

@@ -68,6 +68,27 @@ def test_bool_coercion(monkeypatch, raw, expected):
     assert dc.DEFAULT_CONFIG["checkpoint_enabled"] is expected
 
 
+def test_reasoning_thinking_overrides(monkeypatch):
+    """The provider reasoning/thinking knobs are env-configurable (non-interactive runs)."""
+    dc = _reload_with_env(
+        monkeypatch,
+        TRADINGAGENTS_OPENAI_REASONING_EFFORT="high",
+        TRADINGAGENTS_GOOGLE_THINKING_LEVEL="minimal",
+        TRADINGAGENTS_ANTHROPIC_EFFORT="low",
+    )
+    assert dc.DEFAULT_CONFIG["openai_reasoning_effort"] == "high"
+    assert dc.DEFAULT_CONFIG["google_thinking_level"] == "minimal"
+    assert dc.DEFAULT_CONFIG["anthropic_effort"] == "low"
+
+
+def test_reasoning_effort_defaults_to_none(monkeypatch):
+    """Unset reasoning/thinking knobs stay None so each provider uses its own default."""
+    dc = _reload_with_env(monkeypatch)
+    assert dc.DEFAULT_CONFIG["openai_reasoning_effort"] is None
+    assert dc.DEFAULT_CONFIG["google_thinking_level"] is None
+    assert dc.DEFAULT_CONFIG["anthropic_effort"] is None
+
+
 def test_empty_env_value_is_passthrough(monkeypatch):
     """Empty TRADINGAGENTS_* values must not clobber the built-in default."""
     dc = _reload_with_env(
@@ -82,13 +103,23 @@ def test_empty_env_value_is_passthrough(monkeypatch):
 def test_invalid_int_raises(monkeypatch):
     """Garbage int values should surface a ValueError at import, not silently misconfigure."""
     monkeypatch.setenv("TRADINGAGENTS_MAX_DEBATE_ROUNDS", "not-a-number")
-    with pytest.raises(ValueError):
+    with pytest.raises(ValueError, match="TRADINGAGENTS_MAX_DEBATE_ROUNDS"):
         importlib.reload(default_config_module)
     # Restore module state for subsequent tests in this process
     monkeypatch.delenv("TRADINGAGENTS_MAX_DEBATE_ROUNDS", raising=False)
     importlib.reload(default_config_module)
 
 
+@pytest.mark.parametrize("bad", ["treu", "flase", "maybe", "2", "enabled"])
+def test_invalid_bool_raises(monkeypatch, bad):
+    """A misspelled boolean must fail loudly (like ints) instead of silently False."""
+    monkeypatch.setenv("TRADINGAGENTS_CHECKPOINT_ENABLED", bad)
+    with pytest.raises(ValueError, match="TRADINGAGENTS_CHECKPOINT_ENABLED"):
+        importlib.reload(default_config_module)
+    monkeypatch.delenv("TRADINGAGENTS_CHECKPOINT_ENABLED", raising=False)
+    importlib.reload(default_config_module)
+
+
 def test_unknown_env_var_is_ignored(monkeypatch):
     """Env vars outside _ENV_OVERRIDES must not bleed into DEFAULT_CONFIG."""
     dc = _reload_with_env(