Expand LinkedIn Open to Work Role Titles and Improve Visibility

LinkedIn Open to Work currently targets a narrow set of roles. Adding broader titles increases recruiter match surface. Profile also has zero original posts and no featured links.

Acceptance Criteria

• [ ] Add to Open to Work preferences: Computational Scientist, Staff ML Engineer, Principal ML Engineer, AI Infrastructure Engineer
• [ ] Verify location preferences include SF Bay Area, Remote US, Seattle, Boston, NYC
• [ ] Review and update job type preferences (Full-time, Contract if applicable)
• [ ] Add 2-3 featured links (Morphism Systems, PRM paper, key GitHub repos)
• [ ] Update DISCOVERY.md action item status to DONE