chore: add the generated dev container and its build job (spec 026)

.devcontainer/devcontainer-lock.json

@@ -0,0 +1,19 @@
+{
+	"features": {
+		"ghcr.io/devcontainers/features/common-utils:2": {
+			"integrity": "sha256:cb0c4d3c276f157eed17935747e364178d75fee17f55c4e129966f64633deb3a",
+			"resolved": "ghcr.io/devcontainers/features/common-utils@sha256:cb0c4d3c276f157eed17935747e364178d75fee17f55c4e129966f64633deb3a",
+			"version": "2.5.9"
+		},
+		"ghcr.io/devcontainers/features/github-cli:1": {
+			"integrity": "sha256:d22f50b70ed75339b4eed1ba9ecde3a1791f90e88d37936517e3bace0bbad671",
+			"resolved": "ghcr.io/devcontainers/features/github-cli@sha256:d22f50b70ed75339b4eed1ba9ecde3a1791f90e88d37936517e3bace0bbad671",
+			"version": "1.1.0"
+		},
+		"ghcr.io/devcontainers/features/node:1": {
+			"integrity": "sha256:8c0de46939b61958041700ee89e3493f3b2e4131a06dc46b4d9423427d06e5f6",
+			"resolved": "ghcr.io/devcontainers/features/node@sha256:8c0de46939b61958041700ee89e3493f3b2e4131a06dc46b4d9423427d06e5f6",
+			"version": "1.7.1"
+		}
+	}
+}

.devcontainer/devcontainer.json

@@ -0,0 +1,63 @@
+{
+	"containerEnv": {
+		"CI": "1",
+		"GOTOOLCHAIN": "local"
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"anthropic.claude-code",
+				"astro-build.astro-vscode",
+				"bradlc.vscode-tailwindcss",
+				"ms-vscode.makefile-tools",
+				"redhat.vscode-yaml",
+				"tamasfe.even-better-toml"
+			],
+			"settings": {
+				"[go]": {
+					"editor.defaultFormatter": "golang.go"
+				},
+				"[typescript]": {
+					"editor.defaultFormatter": "esbenp.prettier-vscode"
+				},
+				"[typescriptreact]": {
+					"editor.defaultFormatter": "esbenp.prettier-vscode"
+				},
+				"editor.formatOnSave": true,
+				"go.toolsManagement.checkForUpdates": "off",
+				"go.useLanguageServer": true,
+				"vs-kubernetes": {
+					"vs-kubernetes.crd-code-completion": "enabled"
+				},
+				"workbench.browser.openLocalhostLinks": false
+			}
+		}
+	},
+	"features": {
+		"ghcr.io/devcontainers/features/common-utils:2": {
+			"configureZshAsDefaultShell": "false",
+			"installZsh": "true",
+			"username": "vscode"
+		},
+		"ghcr.io/devcontainers/features/github-cli:1": {},
+		"ghcr.io/devcontainers/features/node:1": {
+			"version": "24"
+		}
+	},
+	"forwardPorts": [
+		4321
+	],
+	"image": "mcr.microsoft.com/devcontainers/base:ubuntu-24.04",
+	"name": "Gameplane \u00b7 Website",
+	"portsAttributes": {
+		"4321": {
+			"label": "Astro (website dev)",
+			"onAutoForward": "notify"
+		}
+	},
+	"postCreateCommand": "bash .devcontainer/setup.sh .devcontainer/setup.env",
+	"remoteUser": "vscode",
+	"runArgs": [
+		"--init"
+	]
+}

.devcontainer/ready.txt

@@ -0,0 +1,7 @@
+[devcontainer] ready: Gameplane · Website
+
+Works here:
+  npm ci && npm run check
+
+Ports: 4321 Astro (website dev)
+Tests and lint run in CI (CLAUDE.md rule 8).

.devcontainer/setup.env

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+GO_MODULES=""
+MODULES_DIR="."
+OPTIONAL_STEPS="ai_clis"
+PROFILE="website"
+READY=".devcontainer/ready.txt"
+SPECIFY_VERSION="v1.0.3"
+STEPS="python3 npm_ci_website uv specify ai_clis"
+SUBMODULES=""
+WEBSITE_DIR="."