Set up AI dev environment for recordingtest (#2)

- CLAUDE.md with collaboration rules and Planner/Generator/Evaluator cycle
- .claude/ agents, commands, skills, hooks per Claude Code conventions
- Sprint Contracts for sut-prober, normalizer, recorder, player, diff-reporter
- SUT catalog (EG-BIM Modeler, 187 plugins) and .gitignore excluding SUT tree
- PROGRESS.md / PLAN.md as shared agent handoff state
- Solution scaffold targeting sut-prober PoC

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Recordingtest.SutProber/AssemblyScanner.cs

@@ -0,0 +1,25 @@
+namespace Recordingtest.SutProber;
+
+public sealed record AssemblyEntry(string Name, long SizeBytes, bool HasPdb);
+
+public static class AssemblyScanner
+{
+    private static readonly string[] Prefixes = { "HmEG", "HmGeometry", "HmTriangle", "HmPG", "HmCommon", "Editor", "EditorCore" };
+
+    public static List<AssemblyEntry> Scan(string sutRoot)
+    {
+        var entries = new List<AssemblyEntry>();
+        if (!Directory.Exists(sutRoot)) return entries;
+
+        foreach (var file in Directory.EnumerateFiles(sutRoot, "*.dll", SearchOption.TopDirectoryOnly)
+                     .OrderBy(f => f, StringComparer.Ordinal))
+        {
+            var name = Path.GetFileName(file);
+            if (!Prefixes.Any(p => name.StartsWith(p, StringComparison.Ordinal))) continue;
+
+            var pdb = Path.ChangeExtension(file, ".pdb");
+            entries.Add(new AssemblyEntry(name, new FileInfo(file).Length, File.Exists(pdb)));
+        }
+        return entries;
+    }
+}