uni-plugin-host

Host-side runtime for the uni-db plugin framework. This crate holds the reusable engine implementations that the uni-db API crate wires into Uni/Session/Transaction:

• trigger dispatch + mutation-event extraction (triggers)
• change-data-capture runtime (cdc_runtime)
• background-job scheduler (scheduler, scheduler_persistence)
• meta-plugin system-label persistence (persistence)
• synthetic declared-procedure host (synthetic_procedure)
• commit notifications + session hooks (notifications, hooks)
• OpenTelemetry layer (observability)

It sits above the leaf uni-plugin trait crate and below uni-db. Logic that genuinely needs the Uni lifecycle is inverted behind the [host::HostCypherExecutor] trait, which uni-db implements.