personal memory agent

Refresh README with product-first structure and new screenshots master

Restructure README to lead with experience instead of architecture: - New hero shot of daily dashboard with enriched fixture data - Transcript viewer screenshot showing speaker-diarized dialogue - Entity tracking screenshot showing people/companies/projects - "what you get" section before architecture diagram - Lowercase headings matching sol pbc brand voice - Screenshots use fixture data (no real user data) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>