feat(bin): add captain inbox board #7

Job	Run time
Lint shell scripts	1m 10s
Behavior tests (Herdr)	5m 30s
Behavior portable parallel 1	1m 18s
Behavior portable parallel 2	1m 17s
Repo invariants	7s
Behavior portable serial	17m 15s
Test coverage guard	4s
Stock macOS Bash snapshot compatibility	2m 47s
Behavior timing aggregate	10s
	29m 38s

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