feat(build): support pwa type override

cmd/build/cmd_project.go

@@ -33,6 +33,12 @@ func runProjectBuild(ctx context.Context, buildType string, ciMode bool, targets
 		return coreerr.E("build.Run", "failed to get working directory", err)
 	}
 
+	// PWA builds use the dedicated local web-app pipeline rather than the
+	// project-type builder registry.
+	if buildType == "pwa" {
+		return runLocalPwaBuild(ctx, projectDir)
+	}
+
 	// Load configuration from .core/build.yaml (or defaults)
 	var buildConfig *build.BuildConfig
 	if configPath != "" {
@@ -50,6 +56,10 @@ func runProjectBuild(ctx context.Context, buildType string, ciMode bool, targets
 		return coreerr.E("build.Run", "failed to load config", err)
 	}
 
+	if buildConfig.Build.Type == "pwa" {
+		return runLocalPwaBuild(ctx, projectDir)
+	}
+
 	if err := build.SetupBuildCache(filesystem, projectDir, buildConfig); err != nil {
 		return coreerr.E("build.Run", "failed to set up build cache", err)
 	}

cmd/build/cmd_project_test.go

@@ -162,3 +162,24 @@ func TestBuildCmd_selectOutputArtifacts_Good(t *testing.T) {
 		assert.Equal(t, rawArtifacts, selected)
 	})
 }
+
+func TestBuildCmd_runProjectBuild_PwaOverride_Good(t *testing.T) {
+	expectedWD, err := ax.Getwd()
+	require.NoError(t, err)
+
+	original := runLocalPwaBuild
+	t.Cleanup(func() {
+		runLocalPwaBuild = original
+	})
+
+	called := false
+	runLocalPwaBuild = func(ctx context.Context, projectDir string) error {
+		called = true
+		assert.Equal(t, expectedWD, projectDir)
+		return nil
+	}
+
+	err = runProjectBuild(context.Background(), "pwa", false, "", "", false, false, "", "", false, "", false, false, false)
+	require.NoError(t, err)
+	assert.True(t, called)
+}

cmd/build/cmd_pwa.go

@@ -28,6 +28,10 @@ var (
 	errURLRequired  = coreerr.E("buildcmd.Init", "the --url flag is required", nil)
 )
 
+// runLocalPwaBuild points at the local PWA build entrypoint.
+// Tests replace this to avoid invoking the real build toolchain.
+var runLocalPwaBuild = runBuild
+
 // runPwaBuild downloads a PWA from URL and builds it.
 func runPwaBuild(ctx context.Context, pwaURL string) error {
 	core.Print(nil, "%s %s", i18n.T("cmd.build.pwa.starting"), pwaURL)