Extended the OTLP export bootstrap beyond traces so omp emits the full
OpenTelemetry signal set from a single session.
- Registered a LoggerProvider + BatchLogRecordProcessor and a MeterProvider
+ PeriodicExportingMetricReader when their OTLP endpoints (or the shared
endpoint) are set, each gated independently by OTEL_*_EXPORTER=none,
OTEL_SDK_DISABLED, and http/protobuf protocol checks.
- Bridged the centralized logger through a new registerLogSink API so every
log event also becomes an OTLP log record with severity, attributes, and
active span context for log-trace correlation (min level via OTEL_LOG_LEVEL).
- Recorded gen_ai.client.token.usage and pi.omp.agent.* metrics from the
agent run summary and per-chat usage hooks, and emitted a structured run
summary log event.
- Added an out-of-process logs+metrics probe and gating tests covering the
per-signal kill switches.
Fixes#4604
can1357