`OpsLog` telemetry port for Photon self-metrics and ops events.
Hosts may install additional `OpsLog` adapters at boot. Instrumentation in [`photon/src/runtime/instrumentation/`](../photon/src/runtime/instrumentation/) uses injected [`OpsLog`](src/lib.rs) via `ops_log()`.
Trait + console/no-op + global install wired.