Document 1.11.0 beta.1 release and agent guides
docs: publish alpha.7 manual and guided film
Document 1.8.7 alpha release and security boundaries
Document cleanup of merged feature branches and two-branch policy
Document Alpha1 release policy, migration, branch consolidation, and public support
Document multi-location setup, library, and version-preserving updates
Document SYSTEMX 1.2.0 public format and workflow
Publish SYSTEMX guides for setup, planning, agents, memory, and operations