Add Windows support and conformance coverage

.gitattributes

@@ -0,0 +1,3 @@
+*.go text eol=lf
+*.json text eol=lf
+*.yml text eol=lf

.github/workflows/ci.yml

@@ -32,3 +32,39 @@ jobs:
         run: go build ./...
       - name: Test with race detector and coverage
         run: go test -race -covermode=atomic -coverprofile=coverage.out ./...
+
+  windows:
+    name: Windows amd64
+    runs-on: windows-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: Format
+        shell: bash
+        run: test -z "$(gofmt -l .)"
+      - name: Vet
+        run: go vet ./...
+      - name: Build
+        run: go build ./...
+      - name: Test
+        run: go test -timeout 20m ./...
+
+  windows-arm64:
+    name: Windows arm64
+    runs-on: windows-11-arm
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: Vet
+        run: go vet ./...
+      - name: Build
+        run: go build ./...
+      - name: Test
+        run: go test -timeout 20m ./...

README.md

@@ -193,6 +193,11 @@ Malformed component encodings, invalid type relationships, out-of-bounds
 memory access, bad resource ownership transfers, missing imports, and
 unsupported behavior return errors or named guest traps.
 
+The provider supports Wago on `linux/amd64`, `linux/arm64`, `darwin/amd64`,
+`darwin/arm64`, `windows/amd64`, and `windows/arm64`. Component graphs that
+require a Core WebAssembly feature unavailable on the selected Wago backend
+fail closed during compilation.
+
 ## Test
 
 ```sh

conformance_test.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -17,7 +18,7 @@ import (
 	"github.com/wago-org/component-model/internal/binary"
 )
 
-//go:embed testdata/conformance/manifest.json testdata/conformance/xfail.json testdata/conformance/generated/*.wasm testdata/conformance/wasmtime/manifest.json testdata/conformance/wasmtime/xfail.json testdata/conformance/wasmtime/generated/*.wasm
+//go:embed testdata/conformance/manifest.json testdata/conformance/xfail.json testdata/conformance/xfail_windows.json testdata/conformance/generated/*.wasm testdata/conformance/wasmtime/manifest.json testdata/conformance/wasmtime/xfail.json testdata/conformance/wasmtime/xfail_windows.json testdata/conformance/wasmtime/generated/*.wasm
 var conformanceFixtures embed.FS
 
 type conformanceManifest struct {
@@ -167,6 +168,20 @@ func readConformanceXfails(t *testing.T, path string) map[string]string {
 	if err := json.Unmarshal(data, &xfails); err != nil {
 		t.Fatal(err)
 	}
+	if runtime.GOOS == "windows" {
+		platformPath := strings.TrimSuffix(path, ".json") + "_windows.json"
+		data, err := conformanceFixtures.ReadFile(platformPath)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var platform map[string]string
+		if err := json.Unmarshal(data, &platform); err != nil {
+			t.Fatal(err)
+		}
+		for id, reason := range platform {
+			xfails[id] = reason
+		}
+	}
 	return xfails
 }
 

plugin.go

@@ -53,7 +53,8 @@ func Definition() wago.PluginDefinition {
 		Description: "WebAssembly Component Model execution and Canonical ABI linking for Wago.",
 		Stability:   wago.Experimental,
 		Compatibility: wago.Compatibility{
-			Engines: map[string]string{"wago": ">=0.1.0"},
+			Engines:   map[string]string{"wago": ">=0.1.0"},
+			Platforms: []string{"darwin/amd64", "darwin/arm64", "linux/amd64", "linux/arm64", "windows/amd64", "windows/arm64"},
 		},
 		Provenance: wago.PluginProvenance{
 			Homepage:   "https://github.com/wago-org/component-model#readme",

testdata/conformance/README.md

@@ -39,3 +39,7 @@ failure ledgers in `xfail.json`; an expected failure that starts passing fails
 the suite until its ledger entry is removed. Unsupported parent instances are
 still represented in the manifest, so their child assertions become runnable
 without another fixture import once the parent feature lands.
+
+Platform-specific backend gaps use adjacent `xfail_<goos>.json` ledgers. These
+have the same unexpected-pass behavior as the shared ledger and must only
+describe failures caused by the selected Wago platform backend.

testdata/conformance/wasmtime/xfail_windows.json

@@ -0,0 +1,4 @@
+{
+  "async__intra-streams__0004__L118": "Wago's Windows backend does not yet implement core multi-memory",
+  "async__intra-streams__0006__L179": "Wago's Windows backend does not yet implement core multi-memory"
+}

testdata/conformance/xfail_windows.json

@@ -0,0 +1,4 @@
+{
+  "linking__unit__0036__L261": "Wago's Windows backend does not yet implement core multi-memory",
+  "linking__unit__0054__L355": "Wago's Windows backend does not yet implement core multi-memory"
+}

wago.json

@@ -12,6 +12,7 @@
     "category": "runtime",
     "tags": ["webassembly", "component-model", "canonical-abi", "runtime"],
     "authors": [{"name": "Jairus Tanaka", "github": "JairusSW"}],
-    "engines": {"wago": ">=0.1.0"}
+    "engines": {"wago": ">=0.1.0"},
+    "platforms": ["darwin/amd64", "darwin/arm64", "linux/amd64", "linux/arm64", "windows/amd64", "windows/arm64"]
   }
 }

wago.providers.json

@@ -12,7 +12,15 @@
         "compatibility": {
           "engines": {
             "wago": "\u003e=0.1.0"
-          }
+          },
+          "platforms": [
+            "darwin/amd64",
+            "darwin/arm64",
+            "linux/amd64",
+            "linux/arm64",
+            "windows/amd64",
+            "windows/arm64"
+          ]
         },
         "provenance": {
           "homepage": "https://github.com/wago-org/component-model#readme",
@@ -57,7 +65,7 @@
           }
         ]
       },
-      "definitionDigest": "sha256:e5a10f39c613b58e12e5b59d2cdbda1d5a95eff9b247e15eb3063c532c8dca4c"
+      "definitionDigest": "sha256:d2c00c06100f562cb1fe1ac1289c1d9d09ef2c31a5e15d47a48a4c0a39eb0fd3"
     }
   ]
 }