Split the 564-line core_adapter/lifecycle.rs into a lifecycle/ directory
with dedicated structs for each domain concern (event, hook, fidelity,
auto_status, circuit_breaker, disk, git, artifact), orchestrated by a
WorkflowLifecycle that enforces explicit per-callback ordering.
Also fixes core adapter boundary gaps:
- Handler now uses per-call snapshot/apply context bridge and real graph
instead of STUB_GRAPH
- Executor::run() returns (Outcome, RunState) so run_via_core can
extract the final context instead of returning an empty one
- run_via_core populates git_state on EngineServices for handlers
- Checkpoint resume gains stage_index, next_node_id fallback, and
node_visits reconstruction for old checkpoints
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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