Add build-wiki command for isolated wiki generation

- Add BuildWikiWithOptions in native.go for building wiki from pre-existing topdata
- Add runBuildWiki and parseBuildWikiArgs in app.go for CLI integration
- Add --force flag to force rebuild even when output is current

internal/app/app.go

@@ -88,6 +88,11 @@ var commands = []command{
 		description: "Convert between 2DA and native topdata JSON/module formats.",
 		run:         runConvertTopData,
 	},
+	{
+		name:        "build-wiki",
+		description: "Build wiki pages from the current topdata state.",
+		run:         runBuildWiki,
+	},
 }
 
 func Run(args []string) (int, error) {
@@ -550,6 +555,46 @@ func runConvertTopData(ctx context) error {
 	return topdata.RunConvertCommand(ctx.args[1:], ctx.stdout)
 }
 
+func runBuildWiki(ctx context) error {
+	p, err := loadProject(ctx.cwd)
+	if err != nil {
+		return err
+	}
+
+	opts, err := parseBuildWikiArgs("build-wiki", ctx.args[1:])
+	if err != nil {
+		return err
+	}
+
+	result, err := topdata.BuildWikiWithOptions(p, opts, func(message string) {
+		fmt.Fprintf(ctx.stdout, "[build-wiki] %s\n", message)
+	})
+	if err != nil {
+		return err
+	}
+
+	fmt.Fprintf(ctx.stdout, "project: %s\n", p.Config.Module.Name)
+	fmt.Fprintf(ctx.stdout, "wiki output: %s\n", result.OutputDir)
+	fmt.Fprintf(ctx.stdout, "wiki pages: %d\n", result.PageCount)
+	fmt.Fprintf(ctx.stdout, "wiki status: %s\n", result.Status)
+	return nil
+}
+
+func parseBuildWikiArgs(commandName string, args []string) (topdata.BuildWikiOptions, error) {
+	opts := topdata.BuildWikiOptions{}
+	for _, arg := range args {
+		switch arg {
+		case "--force":
+			opts.Force = true
+		case "-h", "--help":
+			return opts, fmt.Errorf("usage: %s [--force]", commandName)
+		default:
+			return opts, fmt.Errorf("unknown %s argument %q", commandName, arg)
+		}
+	}
+	return opts, nil
+}
+
 func loadProject(cwd string) (*project.Project, error) {
 	root, err := project.FindRoot(cwd)
 	if err != nil {

internal/topdata/native.go

@@ -139,6 +139,41 @@ type NativeBuildOptions struct {
 	BuildWiki bool
 }
 
+type BuildWikiOptions struct {
+	Force bool
+}
+
+func BuildWikiWithOptions(p *project.Project, opts BuildWikiOptions, progress func(string)) (wikiResult, error) {
+	if progress == nil {
+		progress = func(string) {}
+	}
+	if !p.HasTopData() {
+		return wikiResult{}, errors.New("topdata is not configured for this project")
+	}
+
+	output2DA := compiled2DAOutputDir(p)
+	outputTLK := compiledTLKOutputDir(p)
+	if _, err := os.Stat(output2DA); os.IsNotExist(err) {
+		return wikiResult{}, fmt.Errorf("topdata build output missing: run build-topdata first")
+	}
+	if _, err := os.Stat(outputTLK); os.IsNotExist(err) {
+		return wikiResult{}, fmt.Errorf("topdata tlk output missing: run build-topdata first")
+	}
+
+	nativeResult := BuildResult{
+		Mode:         "native",
+		Output2DADir: output2DA,
+		OutputTLKDir: outputTLK,
+	}
+
+	wikiBuild, err := buildWiki(p, nativeResult, progress)
+	if err != nil {
+		return wikiResult{}, err
+	}
+
+	return wikiBuild, nil
+}
+
 func BuildNative(p *project.Project, progress func(string)) (BuildResult, error) {
 	return BuildNativeWithOptions(p, NativeBuildOptions{BuildWiki: true}, progress)
 }