HUE-012 — Implement typed Space-bound Sessions, messages, summaries and branches

Canonical source: docs/roadmap/issues.json · HUE-012

Specification status: TBI · Readiness: agent:blocked

Goal

Allow concurrent independent discussion, execution, research, monitoring and review Sessions without shared mutable context.

Scope

• Persist Session type, Space binding and lifecycle
• Implement messages, branches, attachments and backend-handle references
• Create working summaries without promoting them to Space memory
• Support concurrent active Sessions and explicit type transitions

Acceptance criteria

• Two concurrent Sessions in different Spaces cannot leak messages/context
• Discussion can create a linked execution Session/task
• Session remains resumable across restart
• Backend handle can be replaced without losing HUE Session
• Close/archive retains searchable episodic record

Dependencies

• HUE-009
• HUE-011

Non-goals

• None beyond the documented scope.

Product contract

• docs/02-product-experience.md
• docs/03-spaces-sessions-knowledge.md
• docs/09-data-model-and-apis.md

Implementation handoff requirements

• Preserve the documented security, project, memory and event boundaries.
• Add or update automated tests for every observable acceptance criterion.
• Provide real verification output; do not rely on a worker/agent self-report.
• Update only the exact documentation sections whose status changed.
• Include screenshots or a recording for user-interface changes.
• Include migration, rollback and recovery notes for data/state changes.
• Link the pull request to this issue with Closes #<issue-number>.