docs: split T3 marks, add online-safety column, state the unix philos… #204

Job	Run time
changes	3s
lint	23s
aws-boundary	1m 17s
build	21s
test (PostgreSQL 14)	2m 40s
test (PostgreSQL 15)	2m 32s
test (PostgreSQL 18)	2m 33s
test (PostgreSQL 17)	2m 16s
test (PostgreSQL 16)	2m 39s
smoke test (built pg-sprite artifact)	53s
all-green	2s
	15m 39s

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