FESADev/phases/analysis-model-objects/step1.md

Step 1: node-model-class

Read First

Read these files before editing:

• /AGENTS.md
• /docs/AGENT_RULES.md
• /docs/ARCHITECTURE.md
• /docs/implementation-plans/analysis-model-objects-implementation-plan.md
• /include/fesa/core/Node.hpp
• /tests/core/node_test.cpp

Task

Refine the existing Node model class contract without adding solver state.

Allowed files:

• Modify /include/fesa/core/Node.hpp
• Modify /src/core/Domain.cpp only if constructor/accessor definitions move or change
• Modify /tests/core/node_test.cpp

Required behavior:

• Node exposes id(), coordinates(), x(), y(), z().
• Node exposes static constexpr std::size_t dofCount() or equivalent compile-time DOF count of 6.
• Node does not store equation ids, displacements, residuals, reactions, or constraints.

Tests To Write First

Extend /tests/core/node_test.cpp before production changes:

• Verify Node::dofCount() == 6.
• Verify coordinate order is preserved.
• Verify the returned coordinate data is const from a const Node.

Run the targeted build and confirm RED before implementation.

Acceptance Criteria

Run:

python scripts/validate_workspace.py
ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R domain

Update /phases/analysis-model-objects/index.json step 1 with status and summary.

Do Not

• Do not add equation ids or solver state to Node.