Add .NET feature mapping and validation support

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Improved `clawpatch fix` handoff context and patch-attempt changed-file auditing for dirty-worktree fixes.
 - Improved Node workspace mapping with richer package overview features, generic extension package context, semantic large-source splits, and stricter generated/build ownership hygiene.
 - Improved Kotlin JVM and Android semantic role mapping for Gradle projects, including Android plugin aliases, local type handling, comment/string parsing, and role fallback edges, thanks @mrmans0n.
+- Added C#/.NET detection, conservative `dotnet build` / `dotnet test` defaults, ASP.NET Core route mapping, C#/F#/Visual Basic source groups, and .NET test-project mapping including TUnit, thanks @SimonGuldager with ideas from @danielmarbach.
 
 ## 0.2.0 - 2026-05-17
 

README.md

@@ -67,6 +67,10 @@ validation commands and records a patch attempt under `.clawpatch/`.
   imports, interfaces, inheritance, supertypes, and method signatures
 - Kotlin Android semantic roles for UI entrypoints, ViewModels, data
   boundaries, external clients, and dependency injection, including Metro
+- C#/.NET projects from `.sln`, `.slnx`, `.csproj`, `.fsproj`, and `.vbproj`
+  files, with conservative `dotnet build` / `dotnet test` defaults
+- ASP.NET Core controllers, minimal API endpoints, C#/F#/Visual Basic source
+  groups, and .NET test projects
 - Ruby project metadata, executables, source groups, RSpec/Minitest suites
 - Elixir Mix/Phoenix projects, contexts, Phoenix web slices, runtime config,
   Ecto migrations, project scripts, and ExUnit suites

docs/feature-mapping.md

@@ -50,6 +50,9 @@ Supported deterministic mappers today:
   Rails configs, routes, views, assets, and database files
 - Rust Cargo commands, libraries, workspace crates, and integration tests
 - C/C++ standalone `main()` files, CMake targets, and autotools targets
+- C#/.NET projects from `.sln`, `.slnx`, `.csproj`, `.fsproj`, and `.vbproj`,
+  ASP.NET Core controllers, minimal API endpoints, C#/F#/Visual Basic source
+  groups, and .NET test projects
 - SwiftPM executable targets, library targets, and test suites
 - nested SwiftPM packages
 - Apple/Xcode projects from `project.yml`, `.xcodeproj`, or `.xcworkspace`
@@ -128,6 +131,14 @@ Android UI entrypoints, ViewModels, data boundaries, or dependency injection.
 Kotlin dependency-injection evidence includes Hilt, Dagger, Koin, and Metro
 annotations and imports.
 
+C#/.NET mapping reads solution/project files and C#/F#/Visual Basic source
+without executing MSBuild. It emits project records, bounded source groups,
+test-project records, ASP.NET Core controller routes, and minimal API routes. Default
+validation commands are only generated when there is a single clear solution or
+project target; ambiguous workspaces stay command-null rather than guessing.
+Common generated outputs such as `bin/`, `obj/`, `TestResults/`, and `.g.cs`
+files are skipped.
+
 C/C++ mapping covers generic project shapes only: standalone source files with
 `main()`, CMake `add_executable` / `add_library`, and autotools `bin_PROGRAMS` /
 `lib_LTLIBRARIES`. It deliberately avoids project-specific C dialects such as
@@ -156,5 +167,7 @@ Known gaps:
 - no Django route mapper yet
 - Laravel route parsing is convention-based, does not execute Laravel route discovery,
   and may omit prefixes applied by `Route::group(...)` wrappers
+- C#/.NET mapping does not evaluate MSBuild conditions, imported props/targets,
+  or runtime route conventions
 - no import graph expansion beyond nearby tests yet
 - agent mapping depends on provider quality and validates paths but not semantic intent

docs/index.md

@@ -30,12 +30,12 @@ stderr so pipes stay parseable.
 
 ## What clawpatch does
 
-- **Semantic feature mapping.** Detects npm bins, Next.js routes, React Router routes, Python packages and Flask/FastAPI routes, Ruby/Rails slices, Laravel/PHP slices, Java/Kotlin Gradle modules, Go packages, Rust crates, C/C++ build targets, SwiftPM targets, and common config files as reviewable units.
+- **Semantic feature mapping.** Detects npm bins, Next.js routes, React Router routes, Python packages and Flask/FastAPI routes, Ruby/Rails slices, Laravel/PHP slices, Java/Kotlin Gradle modules, C#/.NET projects and ASP.NET endpoints, Go packages, Rust crates, C/C++ build targets, SwiftPM targets, and common config files as reviewable units.
 - **Automated code review.** Reviews features with AI providers (Codex CLI today), persists findings with severity, category, and line locations.
 - **Explicit fix workflow.** `clawpatch fix` runs validated patches for one finding at a time, never commits or pushes automatically.
 - **Stable state model.** All features, findings, patches live in `.clawpatch/` as JSON, resumable across runs.
 - **Safety first.** Review is read-only, fix refuses dirty worktrees, never auto-commits, validates before accepting patches.
-- **Multi-language.** JavaScript/TypeScript, Python, Ruby, PHP/Laravel, Java/Kotlin, Go, Rust, C/C++, and Swift today; more mappers planned.
+- **Multi-language.** JavaScript/TypeScript, Python, Ruby, PHP/Laravel, Java/Kotlin, C#/.NET, Go, Rust, C/C++, and Swift today; more mappers planned.
 
 ## Pick your path
 

docs/quickstart.md

@@ -48,6 +48,7 @@ This discovers reviewable features:
 - Next.js routes
 - Go packages and commands
 - Java/Kotlin Gradle modules
+- C#/.NET projects, ASP.NET endpoints, source groups, and test projects
 - Python packages, console scripts, Flask/FastAPI routes, and pytest suites
 - JVM semantic role groups
 - Ruby packages, Rails apps, executables, and tests

src/agent-mapper.ts

@@ -55,6 +55,8 @@ const sourceExtensions = new Set([
   ".cxx",
   ".ex",
   ".exs",
+  ".fs",
+  ".fsi",
   ".go",
   ".h",
   ".heex",
@@ -73,15 +75,22 @@ const sourceExtensions = new Set([
   ".swift",
   ".ts",
   ".tsx",
+  ".vb",
 ]);
 
 const manifestNames = new Set([
   "Cargo.toml",
   "CMakeLists.txt",
   "Package.swift",
+  "Directory.Build.props",
+  "Directory.Build.targets",
+  "Directory.Packages.props",
+  "Directory.Packages.targets",
+  "NuGet.config",
   "build.gradle",
   "build.gradle.kts",
   "composer.json",
+  "global.json",
   "go.mod",
   "mix.exs",
   "package.json",
@@ -389,7 +398,7 @@ async function repoInventory(
     weak: weak.weak,
     weakReason: weak.reason,
     allFiles: new Set(files),
-    manifests: files.filter((file) => manifestNames.has(file.split("/").at(-1) ?? "")),
+    manifests: files.filter(isManifestFile),
     topLevelDirs: uniqueStrings(files.map((file) => file.split("/")[0] ?? "").filter(Boolean)),
     fileSamples: files.slice(0, 400),
     sourceFileSamples: sourceFiles.slice(0, 500),
@@ -470,6 +479,11 @@ function isSourceFile(path: string): boolean {
   return ext !== undefined && sourceExtensions.has(ext);
 }
 
+function isManifestFile(path: string): boolean {
+  const name = path.split("/").at(-1) ?? "";
+  return manifestNames.has(name) || /\.(?:sln|slnx|csproj|fsproj|vbproj)$/iu.test(name);
+}
+
 function isTestFile(path: string): boolean {
   return /(^|\/)(test|tests|__tests__)(\/|$)|(?:^|[._-])(?:test|spec)\.[^/]+$/iu.test(path);
 }