docs: upstream sync Apr 5 sync 15 hardening entry (51 commits, 9 security)

docs: upstream sync Apr 5 sync 13 hardening entry (51 commits, 2 security)

docs: upstream sync Apr 5 sync 11 hardening entry (51 commits, 5 security)

docs: upstream sync Apr 5 sync 9 hardening entry (51 commits, 5 security)

docs: upstream sync Apr 5 sync 7 hardening entry (51 commits, 6 security)

docs: sync Apr 3 sync 8 + sync 10 hardening entries

sync: update docs from upstream (Apr 1-2 syncs, issue/PR tracking)

Docs: sync explain docs with upstream — Mar 31 sync 6 (75 commits, 4 security)

Docs: sync explain docs with upstream — Mar 29 sync 10 (75 commits, 7 security)

sync: update docs from upstream (Mar 29 sync 6-8, issue/PR tracking)

docs: add Mar 27 sync 4 hardening entry (75 commits, 10 security)

docs: add Mar 26 sync 6 hardening entry (28 commits, 1 security)

docs: align content accuracy after Mar 26 sync 5

docs: sync Mar 26 sync 5 hardening entry + upstream updates

docs: sync Mar 24 sync 1 + sync 2 hardening entries