Add minimal Go app, post-create script, and update Dockerfile

- Add cmd/sigrok-mcp-server/main.go as minimal compilable entry point
- Add go.mod for module initialization
- Update Dockerfile to build from cmd/ layout and handle missing go.sum
- Extract postCreateCommand into .devcontainer/post-create.sh script
- Add Claude Code devcontainer feature and PATH config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: key

.devcontainer/devcontainer.json

@@ -11,7 +11,11 @@
     "ghcr.io/devcontainers/features/docker-in-docker:2": {},
     "ghcr.io/devcontainers/features/node:1": {
       "version": "lts"
-    }
+    },
+    "ghcr.io/anthropics/devcontainer-features/claude-code:1.0": {}
+  },
+  "remoteEnv": {
+    "PATH": "${containerEnv:HOME}/.local/bin:${containerEnv:PATH}"
   },
   "customizations": {
     "vscode": {
@@ -44,6 +48,5 @@
     }
   },
   "remoteUser": "vscode",
-  "postCreateCommand": "npm install -g markdownlint-cli2 && markdownlint-cli2 --version && echo 'Dev container ready!'",
-  "postStartCommand": "test -w /go/pkg/mod || echo 'WARNING: Go module cache is not writable. Run: docker volume rm sigrok-mcp-server-go-mod-cache and rebuild the container.'"
-}
+  "postCreateCommand": "bash .devcontainer/post-create.sh"
+}

.devcontainer/post-create.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+set -euo pipefail
+
+# Install global npm tools
+npm install -g markdownlint-cli2
+
+# Verify all tools are available
+echo "--- Tool verification ---"
+sigrok-cli --version
+yamllint --version
+golangci-lint version
+gh --version
+node --version
+markdownlint-cli2 --version
+
+# Check Go module cache volume permissions
+if [ ! -w /go/pkg/mod ]; then
+  echo "WARNING: Go module cache is not writable. Run: docker volume rm sigrok-mcp-server-go-mod-cache and rebuild the container."
+fi
+
+echo "Dev container ready!"

Dockerfile

@@ -3,11 +3,11 @@ FROM golang:1.23-bookworm AS builder
 
 WORKDIR /build
 
-COPY go.mod go.sum ./
+COPY go.mod go.sum* ./
 RUN go mod download
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /sigrok-mcp-server .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /sigrok-mcp-server ./cmd/sigrok-mcp-server
 
 # Runtime stage
 FROM debian:bookworm-slim

cmd/sigrok-mcp-server/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	fmt.Fprintln(os.Stderr, "sigrok-mcp-server: not yet implemented")
+	os.Exit(1)
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/KenosInc/sigrok-mcp-server
+
+go 1.23