Add ToolCorrectness metric with full Python deepeval parity#1
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Port of deepeval's ToolCorrectnessMetric with all features: - Deterministic tool calling score (exact match, non-exact, weighted LCS) - LLM-based tool selection scoring when available_tools provided - strict_mode, include_reason, evaluation_params options - Empty list handling matching Python behaviour (scores, not errors) - Prompt template and schema modules following existing patterns
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Summary
ToolCorrectnessMetricto Elixir with full feature parityavailable_toolsare provided (final score = min of both)evaluation_paramsfor comparing:input_parametersand:outputfields beyond tool namestrict_mode,include_reason, and threshold configurationTest plan
tool_correctness_test.exscovers: non-exact match, exact match, ordering (weighted LCS), parameter evaluation, strict mode, reason generation, tool selection (LLM), and validation edge casesmix formatpassesmix credo --strictpassesmix dialyzerpasses