External macOS worker for Tangled Spindle. nnabeyang.tngl.sh/spindle-agent

refactor: own the external worker protocol schema #81

Merged nnabeyang.tngl.sh
targeting main
Merged opened by and assigned to nnabeyang.tngl.sh
targeting main

Moves the canonical external-worker schema and deterministic fixture generation into spindle-agent so protocol generation no longer requires Tangled core.

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