Module engine 

The lifecycle engine (ARCHITECTURE.md §2, §8).

Re-exports

pub use error::EngineError;

pub use plan::Step;

pub use plan::StepKind;

pub use progress::NullProgress;

pub use progress::ProgressSink;

pub use progress::StepProgress;

pub use progress::StepProgressEvent;

pub use run::DownOutcome;

pub use run::Engine;

pub use run::StepTiming;

pub use run::UpOutcome;

pub use run::UpRequest;

Modules

error

Engine errors. Substrate failures pass their own stable code through; the engine adds the step and instance context the §2 contract requires.

plan

Step planning: one validated definition + the derived graph → the ordered steps every substrate executes (§3/§4 share the sequence: provision integrations → prepare → start services → health gate).

progress

Step progress events during up — substrate-agnostic telemetry for agents and human operators.

run

The lifecycle engine (§2): plan steps, checkpoint before proceeding, reconcile recorded state against observation. Shared by up, resume, daemon adoption, and the reaper — they are the same machinery.