test: add ProgramReader tests validating CincyLib port

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

FabWorks.Tests/PressBrake/ProgramReaderTests.cs

@@ -0,0 +1,48 @@
+using FabWorks.Core.PressBrake;
+using Xunit;
+
+namespace FabWorks.Tests.PressBrake
+{
+    public class ProgramReaderTests
+    {
+        [Fact]
+        public void Load_SamplePgm_ParsesProgramAttributes()
+        {
+            var pgm = Program.Load("TestData/sample.pgm");
+
+            // ProgName may be empty on some exports; verify PartName was parsed instead
+            Assert.False(string.IsNullOrEmpty(pgm.PartName));
+        }
+
+        [Fact]
+        public void Load_SamplePgm_ParsesThickness()
+        {
+            var pgm = Program.Load("TestData/sample.pgm");
+            Assert.True(pgm.MatThick > 0);
+        }
+
+        [Fact]
+        public void Load_SamplePgm_ParsesSteps()
+        {
+            var pgm = Program.Load("TestData/sample.pgm");
+            Assert.NotEmpty(pgm.Steps);
+        }
+
+        [Fact]
+        public void Load_SamplePgm_ParsesToolSetups()
+        {
+            var pgm = Program.Load("TestData/sample.pgm");
+            Assert.NotEmpty(pgm.UpperToolSets);
+            Assert.NotEmpty(pgm.LowerToolSets);
+        }
+
+        [Fact]
+        public void Load_SamplePgm_ResolvesStepToolReferences()
+        {
+            var pgm = Program.Load("TestData/sample.pgm");
+            var step = pgm.Steps[0];
+            Assert.NotNull(step.UpperTool);
+            Assert.NotNull(step.LowerTool);
+        }
+    }
+}