feat(bnp): codeless system/page templates — layouts without code (WO-WZ-020)

manifest.yaml gains system_templates + page_templates declarations; each page
template's .ninjatpl source lives at templates/<system>/<key>.ninjatpl and is
validated at pack time. Verify no longer rejects declared system/page
templates on codeless manifests (guest template_keys stay rejected) — the cms
host registers them source-tracked and renders the files through the same
host pongo pipeline powered blocks use. Blog/system/normal page layouts are
now fully expressible with zero code.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

cmd/ninja/internal/bnp/codeless.go

@@ -39,6 +39,18 @@ type manifestYAML struct {
 	SettingsSchema    string   `yaml:"settings_schema"` // JSON file
 	MasterPages       string   `yaml:"master_pages"`   // JSON file ([]masterPageJSON)
 	RequiredIconPacks []string `yaml:"required_icon_packs"`
+	SystemTemplates   []struct {
+		Key         string `yaml:"key"`
+		Title       string `yaml:"title"`
+		Description string `yaml:"description"`
+	} `yaml:"system_templates"`
+	PageTemplates []struct {
+		System      string   `yaml:"system"`
+		Key         string   `yaml:"key"`
+		Title       string   `yaml:"title"`
+		Description string   `yaml:"description"`
+		Slots       []string `yaml:"slots"`
+	} `yaml:"page_templates"`
 	CSS               *struct {
 		NpmPackages    map[string]string `yaml:"npm_packages"`
 		CSSDirectives  []string          `yaml:"css_directives"`
@@ -382,6 +394,30 @@ func applyManifestYAML(dir string, m *abiv1.PluginManifest) error {
 		})
 	}
 
+	for _, st := range my.SystemTemplates {
+		if st.Key == "" || st.Title == "" {
+			return fmt.Errorf("%s: system_templates entries need key and title", manifestYAMLName)
+		}
+		m.SystemTemplates = append(m.SystemTemplates, &abiv1.SystemTemplateMeta{
+			Key: st.Key, Title: st.Title, Description: st.Description,
+		})
+	}
+	for _, pt := range my.PageTemplates {
+		if pt.System == "" || pt.Key == "" || pt.Title == "" {
+			return fmt.Errorf("%s: page_templates entries need system, key, and title", manifestYAMLName)
+		}
+		// Layout source convention: templates/<system>/<key>.ninjatpl,
+		// rendered host-side (core/docs/codeless-bnp.md).
+		rel := filepath.Join(dirTemplates, pt.System, pt.Key+".ninjatpl")
+		if err := fileWithin(dir, rel); err != nil {
+			return fmt.Errorf("%s: page template %s/%s: %w", manifestYAMLName, pt.System, pt.Key, err)
+		}
+		m.PageTemplates = append(m.PageTemplates, &abiv1.PageTemplateMeta{
+			SystemKey: pt.System, Key: pt.Key, Title: pt.Title,
+			Description: pt.Description, Slots: pt.Slots,
+		})
+	}
+
 	if my.MasterPages != "" {
 		mpRaw, err := readJSONFile(my.MasterPages, "master_pages")
 		if err != nil {

cmd/ninja/internal/bnp/codeless_test.go

@@ -29,7 +29,10 @@ func codelessFixture(t *testing.T) string {
 	writeFixture(t, dir, map[string]string{
 		"plugin.mod": "[plugin]\nname = \"fixture-theme\"\nversion = \"0.1.0\"\nkind = \"theme\"\n",
 		"manifest.yaml": "theme_presets: presets.json\nrequired_icon_packs: [lucide]\n" +
-			"master_pages: master_pages.json\n",
+			"master_pages: master_pages.json\n" +
+			"system_templates:\n  - key: fixture\n    title: Fixture Theme\n" +
+			"page_templates:\n  - system: fixture\n    key: landing\n    title: Landing\n    slots: [main]\n",
+		"templates/fixture/landing.ninjatpl": `<main>{{ content }}</main>`,
 		"presets.json":      `{"presets":[{"key":"default"}]}`,
 		"master_pages.json": `[{"key":"landing","title":"Landing","blocks":[{"block_key":"html","title":"Hero","content":{"x":1},"slot":"main","sort_order":1}]}]`,
 		"blocks/blocks.yaml": "blocks:\n  - key: hero\n    title: Hero\n    category: content\n" +
@@ -73,6 +76,9 @@ func TestCodelessBuildAndVerifyRoundTrip(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	if len(m.GetSystemTemplates()) != 1 || len(m.GetPageTemplates()) != 1 || m.GetPageTemplates()[0].GetSystemKey() != "fixture" {
+		t.Errorf("templates = %v / %v", m.GetSystemTemplates(), m.GetPageTemplates())
+	}
 	if !m.GetCodeless() || len(m.GetMasterPages()) != 1 || len(m.GetThemePresets()) == 0 {
 		t.Errorf("manifest = codeless:%v masters:%d presets:%dB",
 			m.GetCodeless(), len(m.GetMasterPages()), len(m.GetThemePresets()))

cmd/ninja/internal/bnp/verify.go

@@ -159,8 +159,8 @@ func CodelessHookViolation(m *abiv1.PluginManifest) error {
 		return viol("template tags/filters (express pure snippets as template partials)")
 	case len(m.GetRbacMethodRoles()) > 0 || len(m.GetCoreServiceBindings()) > 0:
 		return viol("Connect services")
-	case len(m.GetBlocks()) > 0 || len(m.GetTemplateKeys()) > 0 || len(m.GetSystemTemplates()) > 0 || len(m.GetPageTemplates()) > 0:
+	case len(m.GetBlocks()) > 0 || len(m.GetTemplateKeys()) > 0:
-		return viol("guest-rendered blocks/templates (codeless blocks live in blocks/blocks.yaml)")
+		return viol("guest-rendered blocks/template keys (codeless blocks live in blocks/blocks.yaml; layouts are declared system/page templates rendered host-side)")
 	case m.GetDirectoryExtensions().GetPanelSectionCount() > 0 || m.GetDirectoryExtensions().GetPinDecoratorCount() > 0:
 		return viol("directory extension callbacks")
 	case m.GetDataDir():

docs/codeless-bnp.md

@@ -48,7 +48,9 @@ my-theme/
     blocks.yaml         # key/title/category/schema/template/providers per block
     hero.schema.json
     hero.ninjatpl
-  templates/            # reserved for host-rendered page templates (future)
+  templates/            # <system>/<key>.ninjatpl layout sources for the
+                        #   system/page templates declared in manifest.yaml,
+                        #   rendered host-side (blog/system/normal page layouts)
   seed/
     seed.json           # settings {merge/override/ensure}, media, pages, menu_items
     hero.jpg            # media bytes referenced by seed.json entries