docs: bump sphinx version to 1.0.0

test(secure): clean up

fix(ci): hang on tests

test: cleanup - section layout, descriptive names, strict errno asserts

test: fixtures, deterministic asserts, names

test: tighten error-path assertions and refactor init-errors fixture

chore(tests): standarize file headers and reuse shared fixture

fix(build): cast enum to unsigned in kind range check

test(secure): fix init_vol_hdr_bad_wrapper_version on ECC flash

test(secure): add concurrency + stress parity