Background service: daemonize the worker + durable pause/resume switch #31

Job	Run time
pins are exact (CONST-PI-VERSION-PINNED)	5s
no automatic merge (CONST-MERGE-NEVER-AUTOMATIC)	5s
the job image holds its contract	1m 16s
pinned assumptions still hold (offline, no API key)	1m 14s
	2m 40s

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