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

feat: add Swift Spindle runtime composition #66

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

Add the independent Swift Spindle's runtime composition for the XRPC server, Jetstream/Knot event transport, and persistent pipeline lifecycle.

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