docs: publish four-part 4K system field guide and alpha.3 manual
Document Tier 2 AUTOBOT, Agent Alpha, and local DATA for alpha.2
Document Agent Y four-role workflow and alpha.4 release
Expand full-project and shared-workspace manual with current diagrams
Document SYSTEMX PROJECTS scopes, setup, and 1.7 alpha release
Add visual guides for advanced use cases and subagent processing