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

feat: add Swift Spindle XRPC server boundary #64

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

Add the reusable Hummingbird HTTP and WebSocket boundary for the independent Swift Spindle.

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