Scaffold GitManager multi-repo dashboard

Runnable skeleton per AGENT.md: Echo server (/, /help, /healthz, /api/repos), read-only repo scanner with in-memory index, the internal/git boundary, the <repo-list> web component with design tokens, and dev tooling (Dockerfile, docker-compose, air, .env.example).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/render/render.go

@@ -0,0 +1,31 @@
+// Package render wires Go html/template page shells into Echo. The server emits
+// the page shell and declares web components; the components fetch their own
+// data (AGENT.md §1.1, §2).
+package render
+
+import (
+	"html/template"
+	"io"
+	"path/filepath"
+
+	"github.com/labstack/echo/v4"
+)
+
+// Templates implements echo.Renderer over the templates in a directory.
+type Templates struct {
+	tmpl *template.Template
+}
+
+// New parses every *.html file in dir.
+func New(dir string) (*Templates, error) {
+	t, err := template.ParseGlob(filepath.Join(dir, "*.html"))
+	if err != nil {
+		return nil, err
+	}
+	return &Templates{tmpl: t}, nil
+}
+
+// Render satisfies echo.Renderer.
+func (t *Templates) Render(w io.Writer, name string, data any, _ echo.Context) error {
+	return t.tmpl.ExecuteTemplate(w, name, data)
+}