Pulls real player-posted freight jobs from FIO's /localmarket/shipping
endpoints (public, no auth - distinct from the CONTD player-contract
system, which isn't exposed via any API). Ranks by margin after real
one-way fuel cost (puga.shipping.leg_cost), flagging ads that exceed the
account's ship hold or route through an unmeasured gateway.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
