From 20256eec010055e9c6bee8a62953970bf1b88e70 Mon Sep 17 00:00:00 2001
From: Jukka Aho <ahojukka5@gmail.com>
Date: Sat, 9 May 2026 16:49:10 +0300
Subject: [PATCH] refactor(domains): remove trusses/api.jl stub

Drop unused truss API placeholder pending structured truss kernels.
---
 src/domains/trusses/api.jl | 79 --------------------------------------
 1 file changed, 79 deletions(-)
 delete mode 100644 src/domains/trusses/api.jl

diff --git a/src/domains/trusses/api.jl b/src/domains/trusses/api.jl
deleted file mode 100644
index 61ab7cb..0000000
--- a/src/domains/trusses/api.jl
+++ /dev/null
@@ -1,79 +0,0 @@
-# This file is a part of JuliaFEM.
-# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
-
-"""
-Truss formulation API definitions.
-
-This file defines truss-specific abstract types and formulation theories.
-Must be included after core api.jl.
-"""
-
-# ============================================================================
-# TRUSS FORMULATION THEORIES
-# ============================================================================
-
-"""
-    AbstractTrussTheory
-
-Abstract type for truss theory variants.
-
-Truss elements carry only axial forces (tension/compression), no bending.
-
-# Concrete Theories
-- `SimpleTruss`: Standard 2-node truss (axial force only)
-
-# Future Extensions
-- `CableTruss`: Cable elements (tension only, no compression)
-- `PretensionedTruss`: Trusses with initial stress
-
-# See Also
-- [`TrussFormulation`](@ref)
-"""
-abstract type AbstractTrussTheory end
-
-"""
-    SimpleTruss <: AbstractTrussTheory
-
-Simple truss theory (axial force only).
-
-Assumptions:
-- Only axial forces (tension/compression)
-- No bending moments
-- Pin-jointed connections
-- 3 DOFs per node in 3D: (ux, uy, uz)
-- 2 DOFs per node in 2D: (ux, uy)
-
-# Usage
-```julia
-formulation = TrussFormulation{SimpleTruss}()
-physics = Physics(
-    formulation=formulation,
-    field=Displacement{3}(),  # 3D truss
-    mesh=truss_mesh,
-    material=steel
-)
-```
-"""
-struct SimpleTruss <: AbstractTrussTheory end
-
-"""
-    TrussFormulation{Theory<:AbstractTrussTheory} <: AbstractFormulation
-
-Truss element formulation with theory variant.
-
-# Type Parameter
-- `Theory`: Truss theory type (SimpleTruss, CableTruss, etc.)
-
-# Examples
-```julia
-# Standard truss
-TrussFormulation{SimpleTruss}()
-```
-
-# Fields per Node
-- 3D: 3 DOFs (ux, uy, uz)
-- 2D: 2 DOFs (ux, uy)
-
-Use with `Displacement{Dim}` field type.
-"""
-struct TrussFormulation{Theory<:AbstractTrussTheory} <: AbstractFormulation end