Persistent localhost servers (macOS launchd)

One script does everything. Resolve scripts/persistent-localhost.sh relative to this SKILL.md, never from the current directory.

Workflow

1. Check what already exists:

scripts/persistent-localhost.sh list

2. Start the server. --name is the handle. --port enables readiness checks and duplicate handling. --dir defaults to the current directory.

scripts/persistent-localhost.sh start --name myproj --port 5111 --cmd "./bin/serve"

The command returns only after the port is listening, or fails with the last 20 log lines. Report the printed URL= to the user.