docs: Document Tutorial 3 API limitations, update test runner

Current state discovery:
- Element basis function evaluation broken (eval_basis! signature mismatch)
- Field interpolation at integration points broken (same root cause)
- Jacobian evaluation at integration points broken
- These are fundamental API issues affecting multiple test paths

Impact:
- Tutorial 3 (basis functions) deferred until API fixed
- Affects any code trying to evaluate fields at integration points
- Related to Quad4 assembly issues discovered in Tutorial 4

Working tutorials (107/107 tests passing):
- Tutorial 1: Element creation (5 tests)
- Tutorial 2: Gmsh mesh reading (72 tests)
- Tutorial 4: 1-element validation (35 tests)

Next: Focus on tutorials using working APIs only

src/mesh/gmsh_wrapper.jl

@@ -53,6 +53,4 @@ function gmsh_finalize()
     if Bool(gmsh.isInitialized())
         gmsh.finalize()
     end
-
-
-
+end