Move from mise to Make and DinD

.devcontainer/Dockerfile

@@ -0,0 +1,23 @@
+FROM debian:trixie-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        bash \
+        ca-certificates \
+        curl \
+        git \
+        jq \
+        make \
+        shellcheck \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Node.js 24.x and devcontainer CLI
+RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/* \
+    && npm install -g @devcontainers/cli
+
+RUN groupadd --gid 1000 dev \
+    && useradd --uid 1000 --gid dev --shell /bin/bash --create-home dev
+
+USER dev

.devcontainer/devcontainer-lock.json

@@ -0,0 +1,9 @@
+{
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "version": "2.17.0",
+      "resolved": "ghcr.io/devcontainers/features/docker-in-docker@sha256:25b9f05705ffba7dbe503230ac76081419306f8c8bc88e0ce78c4ecd99a0c78c",
+      "integrity": "sha256:25b9f05705ffba7dbe503230ac76081419306f8c8bc88e0ce78c4ecd99a0c78c"
+    }
+  }
+}

.devcontainer/devcontainer.json

@@ -0,0 +1,12 @@
+{
+  "name": "devcontainer-features",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "remoteUser": "dev",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "moby": false
+    }
+  }
+}

.github/copilot-instructions.md

@@ -9,7 +9,7 @@ src/<feature-name>/
   devcontainer-feature.json   # Metadata, mounts, env vars, postCreateCommand
   install.sh                  # Runs at image build time (root, inside container)
   NOTES.md                    # Human-written design notes — update when making meaningful changes
-  README.md                   # Auto-generated — DO NOT edit directly, run `mise run docs`
+  README.md                   # Auto-generated — DO NOT edit directly, run `make docs`
 test/<feature-name>/
   test.sh                     # Integration test run inside container after feature install
 ```
@@ -19,7 +19,7 @@ test/<feature-name>/
 1. Create `src/<feature-name>/devcontainer-feature.json`, `install.sh`, and `NOTES.md`
 2. Add `test/<feature-name>/test.sh` covering every installed binary and configured file
 3. Add the new feature to the top-level `README.md` features list
-4. Run `mise run docs` to generate `src/<feature-name>/README.md`
+4. Run `make docs` to generate `src/<feature-name>/README.md`
 
 ## `install.sh` Conventions
 
@@ -42,14 +42,14 @@ reportResults
 
 - Add a `check` for every binary installed and every file/env var configured
 - Always write tests for new functionality before considering it complete
-- Run tests: `mise run test` (tests against debian, ubuntu, fedora-toolbox, devcontainers/base:ubuntu)
+- Run tests: `make test` (tests against debian, ubuntu, fedora-toolbox, devcontainers/base:ubuntu)
 
 ## Before Committing
 
 ```sh
-mise run lint-shell   # ShellCheck all .sh files
-mise run docs         # Regenerate README.md from devcontainer-feature.json + NOTES.md
-mise run test         # Full integration test suite (requires Docker)
+make lint-shell   # ShellCheck all .sh files
+make docs         # Regenerate README.md from devcontainer-feature.json + NOTES.md
+make test         # Full integration test suite (requires Docker)
 ```
 
 ## NOTES.md

Makefile

@@ -0,0 +1,16 @@
+.PHONY: help docs lint-shell test
+
+help: ## Show this help
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "  %-15s %s\n", $$1, $$2}'
+
+docs: ## Generate documentation for all features
+	devcontainer features generate-docs -p src -n csutter/devcontainer-features
+
+lint-shell: ## Lint all shell scripts using ShellCheck
+	find . -name '*.sh' -print0 | xargs -0 shellcheck
+
+test: ## Run tests for all features
+	devcontainer features test -i docker.io/library/debian:latest
+	devcontainer features test -i docker.io/library/ubuntu:latest
+	devcontainer features test -i quay.io/fedora/fedora-toolbox:latest
+	devcontainer features test -i mcr.microsoft.com/devcontainers/base:ubuntu