FESADev/phases/property-model-foundation/step1.md

Step 1: property-base-interface

Read First

Read these files before editing:

• /AGENTS.md
• /docs/AGENT_RULES.md
• /docs/implementation-plans/property-model-foundation-implementation-plan.md
• /include/fesa/core/ModelTypes.hpp
• /include/fesa/property/ShellProperty.hpp
• /tests/property/shell_property_test.cpp
• /CMakeLists.txt

Task

Add the runtime property base interface.

Required API:

• File: /include/fesa/property/Property.hpp
• Namespace: fesa::property
• enum class PropertyKind { Shell };
• class Property
  • virtual destructor;
  • virtual PropertyId id() const noexcept = 0;
  • virtual PropertyKind kind() const noexcept = 0;

Rules:

• Use fesa::core::PropertyId.
• Do not add section stiffness or material behavior.
• Keep this header independent from HDF5, MKL, TBB, and parser headers.

Tests To Write First

• Add /tests/property/property_base_test.cpp.
• Test that a small derived class can be used through const Property&.
• Test virtual deletion through std::unique_ptr<Property>.

Acceptance Criteria

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

Verification Notes

1. Run targeted CTest before implementation and confirm the expected compile failure.
2. Keep all code C++17/MSVC-compatible.
3. Update phases/property-model-foundation/index.json for this step result.