Struct ClaudeCanaryLauncher 

pub struct ClaudeCanaryLauncher {
    pub workdir: PathBuf,
}

The real launcher: runs one throwaway claude turn over the same bidirectional stream-json transport a production stage uses.

Nothing in this plan’s test suite executes this type. Every test injects a launcher that writes a canned capture, by design — a guard whose own tests spend real agent invocations is a guard nobody runs. The consequence is that this implementation is reasoned, not witnessed; plan 31-05’s acceptance run against the real CLI is what witnesses it.

Fields

workdir: PathBuf

Working directory for the throwaway child.

Carried as a field because CanaryLauncher::run has nowhere to put a cwd and hermetic_command requires one. Deriving it from the capture path instead would silently couple the child’s working directory to where DevFlow happens to keep its runtime files.

Trait Implementations

impl CanaryLauncher for ClaudeCanaryLauncher

fn run(&self, prompt: &str, capture: &Path) -> Result<(), String>

Run one throwaway agent turn against prompt, teeing its stdout to capture.