Step 3: sets-and-section-properties

Read First

Read these files before editing:

/AGENTS.md
/docs/ARCHITECTURE.md
/docs/ADR.md
/docs/io-definitions/abaqus-input-parser-io.md
/src/fesa/model/domain.hpp
/src/fesa/model/element.hpp
/src/fesa/model/property.hpp
/src/fesa/io/abaqus/input_parser.hpp
/src/fesa/io/abaqus/input_parser.cpp

Review completed parser tests and phase summaries first.

Task

Extend the model and parser only as needed to represent set membership and section-to-property assignment for V0 bar/truss models.

Required behavior:

Parse *NSET, NSET=<name> node membership rows.
Parse *ELSET, ELSET=<name> element membership rows.
Parse one V0 section keyword that assigns a material name to an element set. Prefer the smallest section subset compatible with the current V0 element path.
Preserve deterministic member ordering as read, unless the I/O contract explicitly states otherwise.
Keep Domain as the owner of model definition data. Do not store equation ids on nodes or elements.

Tests To Write First

Add focused C++ tests before production code:

a model test for any new set/section semantic model API;
a parser test proving *NSET, *ELSET, and the selected section keyword map into the semantic model.

Run targeted CTest and confirm the tests fail before implementation.

Acceptance Criteria

ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R "(model_|abaqus_input_parser_)"
python -m unittest discover -s scripts -p "test_*.py"
python scripts/validate_workspace.py

Verification Procedure

Update step 3 status with summary or a concrete error/blocked reason.

Forbidden

Do not parse materials beyond names needed for section linkage.
Do not add loads, boundary conditions, or analysis steps.
Do not generate or modify reference artifacts.

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