new-exec-type

name	new-exec-type
description	Add a new executable type to the flow runner (a new kind of automation block users can define in .flow files).
disable-model-invocation	true
argument-hint	<type-name> — description of what this executable type does
allowed-tools	Bash(flow generate:*) Bash(flow validate:*) Bash(flow build:*) Bash(go test:*) Read

Add a new executable type to the flow runner for: $ARGUMENTS

An "executable type" is a new automation block users can declare in .flow files (like exec, serial, parallel, render). Follow these steps in order:

1. Schema first — add the new type's fields to types/executable/schema.yaml. Read the existing schema to match the structure. Run flow generate to regenerate types/executable/generated.go.

2. Runner handler — create internal/runner/<type>.go implementing the runner interface. Read internal/runner/exec.go or internal/runner/serial.go as reference for the exact interface and pattern.

3. Register the type — wire the new handler into internal/runner/runner.go (the dispatch table).

4. Parser support — update internal/fileparser/ if needed to recognize and validate the new type during YAML parsing.

5. Tests — add unit tests in internal/runner/<type>_test.go using Ginkgo. Use Describe/It/Entry — never FDescribe/FIt. Cover happy path and error cases.

6. Validate — run flow validate to confirm generate, lint, and tests all pass.

Do not skip the schema step — editing generated files directly will cause CI to fail.