Scaffold new Cobra CLI command

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name: new-command description: Scaffold a new Cobra CLI command following the project's patterns. disable-model-invocation: true argument-hint: "<verb> [noun] — what the command does" allowed-tools: mcp__flow__execute, mcp__flow__run_command, mcp__flow__list_executables, Bash(flow build:), Bash(go build:), Read

Scaffold a new Cobra CLI command for: $ARGUMENTS

Before writing any code, read a similar existing command to match the exact style:

• Simple verb commands: cmd/internal/exec.go
• Noun/verb subcommands: cmd/internal/workspace.go or cmd/internal/vault.go — each groups its subcommands in a single file rather than a directory

Then follow these patterns:

1. File location: cmd/internal/<noun>.go. Only root.go lives directly in cmd/; every command handler is under cmd/internal/. Shared helpers go in cmd/internal/helpers.go, flags in cmd/internal/flags/, output shaping in cmd/internal/response/.
2. Command registration: register on the parent command, or add to rootCmd in cmd/root.go
3. Error handling:
   • Runtime errors → errhandler.HandleFatal(ctx, cmd, err)
   • Flag/arg misuse → errhandler.HandleUsage(ctx, cmd, "message", args...)
   • Never use log.Fatal, os.Exit, or logger.Log().FatalErr() in cmd/
4. Context: resolve workspace context via pkg/context before delegating to internal/services
5. Output: respect --output flag (text/json/yaml) for structured responses

After scaffolding, verify it builds — prefer mcp__flow__execute with ref build binary and argument ./bin/flow over a raw shell call.