§H.12 steps 21-22: ELEVATE-REQUEST + ELEVATE-GRANT + SEND-ELEVATE-REQUEST

Phase 7 complete, closing out §H.12's punch list. MSG-DELIVER turned out
to VM-EXEC payload text directly rather than dispatching by type, so the
"handler" is ELEVATE-GRANT, a word the delivered text calls. New Hera-only
C primitives (ZUSE-ELIGIBLE?, NAME>XT, ELEVATE-PUBKEY-UNPACK) stay plain
and unconditional; capsules/zuse-eligibility.4th composes the actual
eligibility check + ACL-ALLOW!/ACL-TTL! grant in FORTH.
SEND-ELEVATE-REQUEST (common:messaging.4th) builds the payload text and
sends it via the item-20-gated CH-REQUEST.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QgooKd5hJNtTYqB6CyK5f9

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