Adds the ability for a cell to signal to a peer that it's willing to
route internet traffic on their behalf. This is the signaling layer
for Phase 3 (per-peer routing via exit cell).
Changes:
- cell_links.json: exit_offered (bool) + remote_exit_offered (bool)
fields with lazy migration (default false for existing records)
- _push_permissions_to_remote: includes exit_offered in the push body
- apply_remote_permissions: accepts exit_offered kwarg; stores it as
remote_exit_offered on the matching cell link
- peer-sync receiver: passes exit_offered from body to apply_remote_permissions
- CellLinkManager.set_exit_offered(cell_name, offered): persists +
triggers push so the remote learns of our offer immediately
- PUT /api/cells/<name>/exit-offer: REST endpoint to toggle the flag
- 12 new tests covering all new paths
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
roof
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