add uncommitted files

scripts/msvc_harness/discovery.py

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+from pathlib import Path
+
+from .models import DiscoveryResult, HarnessConfig, ProjectKind, ProjectSelection
+from .tdd_policy import find_cpp_files
+
+
+class DiscoveryError(RuntimeError):
+    pass
+
+
+def _cmake_entry(source: Path) -> Path | None:
+    for name in ("CMakePresets.json", "CMakeUserPresets.json", "CMakeLists.txt"):
+        candidate = source / name
+        if candidate.is_file():
+            return candidate
+    return None
+
+
+def _single_msbuild(root: Path, explicit: Path | None) -> Path:
+    if explicit is not None:
+        if explicit.is_file() and explicit.suffix.lower() in {".sln", ".vcxproj"}:
+            return explicit
+        raise DiscoveryError(f"configured MSBuild project is invalid: {explicit}")
+    solutions = sorted(root.glob("*.sln"))
+    if len(solutions) > 1:
+        raise DiscoveryError("multiple .sln files found; set msbuild.solution")
+    if solutions:
+        return solutions[0]
+    projects = sorted(root.glob("*.vcxproj"))
+    if len(projects) > 1:
+        raise DiscoveryError("multiple .vcxproj files found; set msbuild.solution")
+    if projects:
+        return projects[0]
+    raise DiscoveryError("no root .sln or .vcxproj was found")
+
+
+def discover_project(root: Path, config: HarnessConfig) -> DiscoveryResult:
+    root = root.resolve()
+    if config.project_type == "cmake":
+        entry = _cmake_entry(config.cmake.source_dir)
+        if entry is None:
+            raise DiscoveryError(
+                f"no CMake project found in {config.cmake.source_dir}"
+            )
+        return DiscoveryResult(ProjectSelection(ProjectKind.CMAKE, entry))
+
+    if config.project_type == "msbuild":
+        project = _single_msbuild(root, config.msbuild.solution)
+        return DiscoveryResult(ProjectSelection(ProjectKind.MSBUILD, project))
+
+    entry = _cmake_entry(root)
+    if entry is not None:
+        return DiscoveryResult(ProjectSelection(ProjectKind.CMAKE, entry))
+
+    solutions = sorted(root.glob("*.sln"))
+    if len(solutions) > 1:
+        raise DiscoveryError("multiple .sln files found; set msbuild.solution")
+    if solutions:
+        return DiscoveryResult(
+            ProjectSelection(ProjectKind.MSBUILD, solutions[0])
+        )
+
+    projects = sorted(root.glob("*.vcxproj"))
+    if len(projects) > 1:
+        raise DiscoveryError("multiple .vcxproj files found; set msbuild.solution")
+    if projects:
+        return DiscoveryResult(
+            ProjectSelection(ProjectKind.MSBUILD, projects[0])
+        )
+
+    cpp_files = find_cpp_files(root)
+    if cpp_files:
+        raise DiscoveryError(
+            "C/C++ files exist but no CMakeLists.txt, preset, .sln, or .vcxproj "
+            "was found; configure projectType and project path"
+        )
+    return DiscoveryResult(None, ())