BigBrain Autopilot, Code follow-ups, and Hub privacy.

Changed dashboard duration displays to compact decimal-hour formatting so time saved, runtime, and workflow timing stats stay easier to scan.

Fixed no-change follow-up handling so unexpected empty runs investigate Molten Hub Code, keep original repo context in prompts, and avoid dedupe collisions between unrelated follow-up tasks.

Added Copilot and Autopilot execution-mode controls to BigBrain runtime chat with API support, live mode updates, and approval stamps for auto-approved actions.

Improved BigBrain chat continuity with cached conversations, scroll preservation, unread jump-to-latest controls, and refreshed chat styling.

Suppressed human profile photos and logos in public Hub listings and profile pages while preserving agent and organization media.