New check_structure_anchor_provisioning audit per spec 1.2a + PHASE2-MAP
F7: four states — both anchors present pass (paths reported only); one
missing/empty WARNs naming the var with the launchers as authoritative
source; neither present emits INFORMATIONAL launcher-equivalent
derivation explicitly labeled non-authoritative (never an error by
design); doctor never exports, writes, or fabricates values — audit
only. Severity follows the doctor's existing note/warn conventions
(warn counts toward --fail-on-warn). Hermetic suite follows the
test-brain-home-check extraction discipline: 7 arms covering all four
states incl. genuinely-unset (env -u) and empty-string forms, plus a
mutation red control proving the empty-vs-set distinction bites
(-n tests replaced by -v in a mutant copy). Registered in
test:framework-shell; enumeration/sanitization/tools-index green.