feat: CrossoverMutator — multi-parent synthesis via LLM (#154)#419
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feat: CrossoverMutator — multi-parent synthesis via LLM (#154)#419
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Adds CrossoverMutator and supporting types to evolver.zig: - Organism struct: code-patch candidate with id, parent lineage (single parent_id + multi-parent parent_ids), generation, diff, fitness - FailureCase struct: test_name + snippet - buildCrossoverPrompt(): constructs bounded prompt showing top-K parents with their fitness, explanations, diffs, and optional history - parseMutationResponse(): extracts EXPLANATION + DIFF from LLM output, strips code fences, returns null on malformed - CrossoverMutator.crossover(): caps at k parents, tracks multi-parent lineage; placeholder for LLM call pending API integration 6 new tests covering prompt construction (all parents present, history inclusion), response parsing (valid + garbage), crossover child creation (parent IDs, generation), and k-capping behavior. All 24 evolver tests pass. Made-with: Cursor
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Summary
Organismstruct withparent_ids: ?[]const u64for multi-parent lineage trackingFailureCasestruct: test_name + snippetbuildCrossoverPrompt(): Constructs bounded prompt showing top-K parents with fitness scores, explanations (400 chars), diffs (2000 chars), and optional learning historyparseMutationResponse(): Extracts EXPLANATION + DIFF sections, strips ```diff fencesCrossoverMutator.crossover(): Caps at k parents, builds multi-parent child with lineage tracking; placeholder for LLM callTest plan
zig test src/evolver.zig— 24/24 tests passCloses #154
Made with Cursor