Integrate SourceOS State Integrity for cloud/fog shell continuity

[mdheller]

Purpose

Use SourceOS State Integrity as the durable substrate for cloud/fog shell continuity, remote execution, device handoff, and policy-bounded workspace replication.

Canonical spec: SourceOS-Linux/sourceos-spec/docs/architecture/sourceos-state-integrity-layer.md
Program tracker: SourceOS-Linux/sourceos-spec#83

Scope

• shell session continuity
• remote execution state
• resumable agent jobs
• local/remote workspace mirrors
• transport mode awareness
• corporate firewall mode
• local-only and air-gapped mode
• profile-scoped cloud/fog state

Requirements

• Register cloud/fog shell components as actors.
• Never treat transport availability as permission.
• Ask Policy Fabric before replicating workspace, memory, model, or agent state.
• Preserve local-first operation when remote transport is unavailable.
• Emit structured state events for Sherlock/Holmes/Lampstand.

Acceptance criteria

• Cloud/fog shell has a documented actor registration path.
• Remote execution state has profile/workspace boundaries.
• Sync/replication failures are classified as transport, policy, schema, conflict, or repair states rather than generic errors.