fix: forward AI audit API keys from TOML config to signal builders

_build_crisis_response_kwargs and _build_taco_rebound_kwargs were
missing ai_audit_api_key, ai_audit_fallback_api_key, and
ai_audit_anthropic_api_key in their string_keys sets. API keys set
in TOML config were silently ignored — only env vars worked.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Pigbibi

src/quant_strategy_plugins/strategy_plugin_runner.py

@@ -550,6 +550,9 @@ def _build_crisis_response_kwargs(plugin_config: Mapping[str, Any]) -> dict[str,
         "ai_audit_anthropic_base_url",
         "ai_audit_anthropic_model",
         "ai_audit_anthropic_version",
+        "ai_audit_api_key",
+        "ai_audit_fallback_api_key",
+        "ai_audit_anthropic_api_key",
     }
     numeric_keys = {
         "synthetic_attack_multiple",
@@ -617,6 +620,9 @@ def _build_taco_rebound_kwargs(plugin_config: Mapping[str, Any]) -> dict[str, An
         "ai_audit_anthropic_base_url",
         "ai_audit_anthropic_model",
         "ai_audit_anthropic_version",
+        "ai_audit_api_key",
+        "ai_audit_fallback_api_key",
+        "ai_audit_anthropic_api_key",
     }
     numeric_keys = {
         "crisis_guard_drawdown",