Overhaul documentation: add skills.sh install, claims, fix stale content master
Major changes: - Homepage rewritten: leads with skill install command, updated feature list - Quick-start rewritten: three tiers (skill install, standalone script, raw API) - Lexicons reference: added network.comind.claim with full schema - Cognition page: streamlined to guide format, links to lexicons for schemas - Architecture: removed session language, updated subagents, added claims - Central about: fixed model, removed sessions, added X handle - VitePress config: reordered nav, added X social link, added blog posts - Fixed session language across memory-infrastructure.md - Tools index: updated counts after pruning 🤖 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com>