feat(bin): add captain inbox board (#1) #3

Job	Run time
Behavior portable serial	14m 50s
Test coverage guard	6s
Behavior portable parallel 2	1m 15s
Repo invariants	5s
Lint shell scripts	1m 45s
Behavior tests (Herdr)	5m 28s
Behavior portable parallel 1	1m 25s
Stock macOS Bash snapshot compatibility	2m 20s
Behavior timing aggregate	6s
	27m 20s

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