Expose SourceOS State Integrity context in shell ergonomics

[mdheller]

Purpose

SourceOS Shell should expose State Integrity context as ambient local-first operating state.

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

Required context

• active profile
• active workspace
• active device
• daemon availability
• degraded state
• policy block state
• conflict state
• repair-needed state
• repo/worktree relation where applicable

Requirements

• Consume structured CLI/daemon state, not raw log scraping.
• Keep shell output quiet unless state needs operator attention.
• Route users to sourceos sync status, sourceos sync doctor, and sourceos sync explain <object>.
• Coordinate with TurtleTerm and Neovim surfaces.

Acceptance criteria

• SourceOS Shell has a documented State Integrity context contract.
• Prompt/status integration distinguishes clean, degraded, conflicted, policy-blocked, and offline/local-only states.
• Shell ergonomics do not assume cloud connectivity.