feat(cli): add cobra-based CLI with subcommands

Replace simple argument parsing with cobra to provide better CLI experience:

- Add 'execute' subcommand for running TypeScript files
- Add 'types' subcommand for printing TypeScript type declarations
- Add help text and error handling
- Update documentation with new usage examples

Add dependencies: github.com/spf13/cobra, github.com/spf13/pflag

.gitignore

@@ -0,0 +1 @@
+.opencode

README.md

@@ -48,6 +48,12 @@ The project is cleanly separated into three packages:
 go build ./cmd/poiesis
 ```
 
+## CLI Options
+
+- `[file]` - Path to TypeScript file to execute (optional)
+- `--print-types` - Print TypeScript type declarations for all registered functions
+- `--help` - Show help information
+
 ## Testing
 
 ```bash
@@ -58,8 +64,9 @@ golangci-lint run
 ## Usage
 
 ```bash
-poiesis <typescript-file>
-poiesis -print-types
+poiesis execute [file]      # Run TypeScript file
+poiesis types               # Print TypeScript type declarations
+poiesis --help              # Show help
 ```
 
 ## Function System

cmd/poiesis/main.go

@@ -5,36 +5,64 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/spf13/cobra"
 	"reichard.io/poiesis/internal/runtime"
 )
 
-func main() {
-	// Validate Arguments
-	if len(os.Args) < 2 {
-		fmt.Fprintln(os.Stderr, "Usage: poiesis <typescript-file>")
-		fmt.Fprintln(os.Stderr, "       poiesis -print-types")
-		os.Exit(1)
-	}
-
-	// Print Types
-	if os.Args[1] == "-print-types" {
-		rt, err := runtime.New(context.Background())
+var runCmd = &cobra.Command{
+	Use:   "execute [file]",
+	Short: "Transpile and execute TypeScript code",
+	Long: `Poiesis transpiles TypeScript to JavaScript using esbuild and executes it with QuickJS.
+It also provides a builtin system for exposing Go functions to TypeScript.`,
+	Args: cobra.MaximumNArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		ctx := context.Background()
+		rt, err := runtime.New(ctx)
 		if err != nil {
-			panic(err)
+			fmt.Fprintf(os.Stderr, "Failed to create runtime: %v\n", err)
+			os.Exit(1)
+		}
+
+		if len(args) == 0 {
+			fmt.Fprintln(os.Stderr, "Usage: poiesis execute [file]")
+			cmd.Help()
+			os.Exit(1)
+		}
+
+		if err := rt.RunFile(args[0]); err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to run file: %v\n", err)
+			os.Exit(1)
+		}
+	},
+}
+
+var typesCmd = &cobra.Command{
+	Use:   "types",
+	Short: "Print TypeScript type declarations",
+	Run: func(cmd *cobra.Command, args []string) {
+		ctx := context.Background()
+		rt, err := runtime.New(ctx)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to create runtime: %v\n", err)
+			os.Exit(1)
 		}
 		fmt.Println(rt.GetTypeDeclarations())
-		return
-	}
+	},
+}
 
-	// Create Runtime
-	rt, err := runtime.New(context.Background())
-	if err != nil {
-		panic(err)
-	}
+var rootCmd = &cobra.Command{
+	Use:   "poiesis",
+	Short: "TypeScript transpiler and executor",
+}
 
-	// Run File
-	filePath := os.Args[1]
-	if err := rt.RunFile(filePath); err != nil {
-		panic(err)
+func init() {
+	rootCmd.AddCommand(runCmd)
+	rootCmd.AddCommand(typesCmd)
+}
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
 	}
 }

go.mod

@@ -10,7 +10,10 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/cobra v1.10.2 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
 	github.com/tetratelabs/wazero v1.9.0 // indirect
 	golang.org/x/sys v0.37.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -1,15 +1,24 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/evanw/esbuild v0.27.2 h1:3xBEws9y/JosfewXMM2qIyHAi+xRo8hVx475hVkJfNg=
 github.com/evanw/esbuild v0.27.2/go.mod h1:D2vIQZqV/vIf/VRHtViaUtViZmG7o+kKmlBfVQuRi48=
 github.com/fastschema/qjs v0.0.6 h1:C45KMmQMd21UwsUAmQHxUxiWOfzwTg1GJW0DA0AbFEE=
 github.com/fastschema/qjs v0.0.6/go.mod h1:bbg36wxXnx8g0FdKIe5+nCubrQvHa7XEVWqUptjHt/A=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/tetratelabs/wazero v1.9.0 h1:IcZ56OuxrtaEz8UYNRHBrUa9bYeX9oVY93KspZZBf/I=
 github.com/tetratelabs/wazero v1.9.0/go.mod h1:TSbcXCfFP0L2FGkRPxHphadXPjo1T6W+CseNNY7EkjM=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
 golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=