Gradient Bang Files

Fixed

• list_known_ports no longer builds an overlong PostgREST .in(...) URL for long-lived characters; ports are now loaded via a direct Postgres query against only the BFS-searched sectors, unblocking session startup for explored players.
• Port commodity sell trades now emit realized FIFO net profit instead of gross sale revenue, keeping tutorial trade-profit progress aligned with the voice agent.
• Tightened voice-agent prompt and create_corporation schema to discourage auto-founding a corp on cost/info questions ("how much for a corp?") and to nudge the agent toward asking for a name first.
• Added a corp-ship-purchase worked example to the voice-agent prompt and a rule against deferring ship purchases to the UI, to reduce cases where the agent refuses voice purchases.