Feat v0.10.0 panel manifest lifecycle

Panels are a new kernel rendering tier between surfaces and block
renderers, enabling composable companion views (e.g. notes panel
inside chat). This version ships the plumbing layer:

- Manifest validation for panels field (provider map + consumer array)
- Soft-dep warning at install time for unresolved panel consumers
- PanelMeta struct + resolvePanels() resolves consumers at surface load
- window.__PANELS__ injected into base template
- sw.panels SDK module (open/close/toggle/isOpen/isAvailable/list/active)
- Lazy JS loading pipeline with module caching
- 10 new tests (6 validation + 4 resolve)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/pages/panels_test.go

@@ -0,0 +1,141 @@
+package pages
+
+import (
+	"context"
+	"testing"
+
+	"armature/store"
+)
+
+func TestResolvePanels_HappyPath(t *testing.T) {
+	// Provider package with a panels map
+	provider := &store.PackageRegistration{
+		ID:      "notes",
+		Title:   "Notes",
+		Enabled: true,
+		Source:  "extension",
+		Manifest: map[string]any{
+			"panels": map[string]any{
+				"reference": map[string]any{
+					"entry":         "js/panels/reference.js",
+					"title":         "Notes Reference",
+					"icon":          "📝",
+					"description":   "Searchable note list",
+					"min_width":     float64(280),
+					"default_width": float64(400),
+				},
+			},
+		},
+	}
+
+	// Consumer package that wants notes.reference
+	consumer := &store.PackageRegistration{
+		ID:      "chat",
+		Title:   "Chat",
+		Enabled: true,
+		Source:  "extension",
+		Manifest: map[string]any{
+			"panels": []any{"notes.reference"},
+		},
+	}
+
+	e := testEngine(t, provider, consumer)
+	panels := e.resolvePanels(context.Background(), consumer.Manifest)
+
+	if len(panels) != 1 {
+		t.Fatalf("expected 1 panel, got %d", len(panels))
+	}
+	p := panels[0]
+	if p.PanelID != "notes.reference" {
+		t.Errorf("expected panel_id 'notes.reference', got %q", p.PanelID)
+	}
+	if p.PackageID != "notes" {
+		t.Errorf("expected package_id 'notes', got %q", p.PackageID)
+	}
+	if p.Entry != "js/panels/reference.js" {
+		t.Errorf("expected entry 'js/panels/reference.js', got %q", p.Entry)
+	}
+	if p.Title != "Notes Reference" {
+		t.Errorf("expected title 'Notes Reference', got %q", p.Title)
+	}
+	if p.Icon != "📝" {
+		t.Errorf("expected icon '📝', got %q", p.Icon)
+	}
+	if p.MinWidth != 280 {
+		t.Errorf("expected min_width 280, got %d", p.MinWidth)
+	}
+	if p.DefaultWidth != 400 {
+		t.Errorf("expected default_width 400, got %d", p.DefaultWidth)
+	}
+}
+
+func TestResolvePanels_ProviderMissing(t *testing.T) {
+	// Consumer references a package that doesn't exist
+	consumer := &store.PackageRegistration{
+		ID:      "chat",
+		Title:   "Chat",
+		Enabled: true,
+		Source:  "extension",
+		Manifest: map[string]any{
+			"panels": []any{"nonexistent.panel"},
+		},
+	}
+
+	e := testEngine(t, consumer)
+	panels := e.resolvePanels(context.Background(), consumer.Manifest)
+
+	if len(panels) != 0 {
+		t.Errorf("expected 0 panels for missing provider, got %d", len(panels))
+	}
+}
+
+func TestResolvePanels_ProviderDisabled(t *testing.T) {
+	provider := &store.PackageRegistration{
+		ID:      "notes",
+		Title:   "Notes",
+		Enabled: false, // disabled
+		Source:  "extension",
+		Manifest: map[string]any{
+			"panels": map[string]any{
+				"reference": map[string]any{
+					"entry": "js/panels/reference.js",
+					"title": "Notes Reference",
+				},
+			},
+		},
+	}
+
+	consumer := &store.PackageRegistration{
+		ID:      "chat",
+		Title:   "Chat",
+		Enabled: true,
+		Source:  "extension",
+		Manifest: map[string]any{
+			"panels": []any{"notes.reference"},
+		},
+	}
+
+	e := testEngine(t, provider, consumer)
+	panels := e.resolvePanels(context.Background(), consumer.Manifest)
+
+	if len(panels) != 0 {
+		t.Errorf("expected 0 panels for disabled provider, got %d", len(panels))
+	}
+}
+
+func TestResolvePanels_NoPanelsField(t *testing.T) {
+	consumer := &store.PackageRegistration{
+		ID:      "chat",
+		Title:   "Chat",
+		Enabled: true,
+		Source:  "extension",
+		Manifest: map[string]any{},
+	}
+
+	e := testEngine(t, consumer)
+	panels := e.resolvePanels(context.Background(), consumer.Manifest)
+
+	if panels != nil {
+		t.Errorf("expected nil panels for manifest without panels field, got %v", panels)
+	}
+}