Three changes to keep the outbound /peer/accept call sites consistent
with the new approval-token mechanism:
1. /approve outbound body now forwards approvalToken from the queued
peer_approval_requests row when present. Receiver's awaiting_approval
branch verifies it and promotes mutual approval. Legacy null-token
rows omit the field; receiver falls through autoAccept gate. Spec §3.7.
2. /approve and /peer/initiate 202 paths now capture the approvalToken
returned by the remote and store it on the local federation_peers row.
Without this, the symmetric autoAccept=0 mutual-approval flow could
not verify on the eventual return /peer/accept. Spec §3.7.
3. /approve and /peer/initiate 200 paths now include approvalToken=null
in the activation UPDATE — single-use lifecycle hygiene per §3.2.
Test coverage: +6 tests (4 in approveOutbound, 2 in peerInitiateOutbound).
Total: 301 → 307. Web tsc clean.
