docs: feature remade beta product film and engineering map
docs: publish beta explainer guide and media links
Document beta.4 white paper and current release
Document 1.11.0 beta.1 release and agent guides
docs: feature public YouTube introduction and 4K thumbnail
docs: publish white paper edition 2.0 manual
Document alpha.3 hardening and verified release in wiki
Document Agent Y CLI channels and 1.9.0 alpha.2 release
Expand full-project and shared-workspace manual with current diagrams
Add visual guides for advanced use cases and subagent processing
Restructure user manual and document founder vision and agent workflows
Document Alpha1 release policy, migration, branch consolidation, and public support
Add efficiency, technical, stack, about, and lifecycle guides