Emit deployment-lifecycle audit events (!412) · Merge requests · Solar / Squid

Summary

Record the deployment lifecycle into the persisted Event audit stream: started, resumed, manual-intervention raised/submitted, guided-failure raised, succeeded, failed, timed-out, canceled.
Emission is generic and centralized — a single auto-discovered IDeploymentLifecycleHandler (DeploymentAuditEventHandler) subscribes to the lifecycle events the pipeline already emits and maps each milestone to one EventCategory. No scattered RecordAsync calls; no producer changes.
Audit writes run in a fresh DI scope (ILifetimeScope.BeginLifetimeScope) so they persist independently of the deployment transaction. The lifecycle publisher already isolates handler exceptions, so an audit-write failure can never fail a deployment.
Pure DeploymentAuditEventFactory projects the shared DeploymentTaskContext → RecordEventRequest (document FKs + display-name references), kept side-effect-free for unit testing.
Dispatch the previously-dropped DeploymentTimedOutEvent in the lifecycle base (additive no-op hook) so timed-out deployments are audited as failures.

Purely additive — no existing signature or behavior changed. Builds on the Event foundation from #411.

Unit (16): DeploymentAuditEventFactory projection across all categories + null-context/no-deployment guards; lifecycle base dispatch including the new timeout hook.
Integration (real Postgres, 7): handler → DB via the real fresh-scope path; full ordered lifecycle trail; failed/timed-out → DeploymentFailed; cross-document feed visibility; pre-deployment-data no-op; real IDeploymentLifecycle publisher dispatches to the auto-registered handler.
E2E (full ProcessAsync, no Kind, 2): successful pipeline records Started→Succeeded with references; failed pipeline records DeploymentFailed.
Regression: full solution build clean; 268 lifecycle/activity-logger/events/pipeline unit tests green; verified in isolation (PR builds + passes on clean main).