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FESADev/.codex/skills/fem-implementation-tdd/SKILL.md
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name, description
name description
fem-implementation-tdd Plan, implement, or correct structural FEM solver code with behavior-focused tests and configured verification.

FEM Implementation

Read the assigned task, directly affected contracts, and repository build configuration. Keep the change minimal and preserve public boundaries, units, ordering, state ownership, deterministic behavior, and fail-closed diagnostics.

For changed behavior, add or update meaningful verification and observe the failure before a bug fix when practical. Then implement the smallest correction and run affected configured checks. Run the configured full build/test once when the solver feature is complete, requested, or needed after broad impact. Required reference comparison must validate identity, quantities, units, row completeness, finite values, metrics, and the approved tolerance; do not alter references or tolerances to pass.

Read toolchain-and-verification.md when selecting configured commands or evaluating comparison evidence. Return changed files, commands and exit codes, decisive results, and blockers. Do not require phase files, automatic Git actions, or a formal RED/GREEN report for harmless refactors with sufficient coverage.