docs: clean up and enrich security model documentation #1392

Job	Run time
prep-release / prepare-release	16s
run / run (ubuntu-latest, 3.12)	1m 19s
run / test-cygwin	6m 36s
run / run (macos-latest, 3.10)	1m 41s
run / run (ubuntu-latest, 3.13)	1m 28s
run / run (ubuntu-latest, 3.14)	1m 14s
run / run (windows-latest, 3.13)	3m 21s
run / run (windows-latest, 3.12)	4m 21s
run / run (windows-latest, 3.10)	3m 42s
run / run (macos-latest, 3.13)	2m 0s
run / run (macos-latest, 3.12)	1m 32s
run / run (macos-latest, 3.14)	1m 52s
run / run (windows-latest, 3.14)	3m 45s
test / test	5m 13s
run / run (macos-latest, 3.11)	1m 35s
run / run (windows-latest, 3.11)	6m 54s
run / run (ubuntu-latest, 3.10)	1m 17s
run / run (ubuntu-latest, 3.11)	3m 47s
source-provenance	-1s
docs / PDF Documentation	3m 31s
docs / Documentation	43s
docs / Landing page	26s
build	-1s
	56m 31s

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