[feature]: Integrate OpenTelemetry Metrics and Traces with Honeycomb

[Jharmony]

OpenTelemetry instrumentation to export metrics (and optionally traces) to Honeycomb for observability.

Tasks

• Add OpenTelemetry JS SDK and OTLP HTTP exporter dependencies.
• Configure metrics exporter to use:
  • OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=https://api.honeycomb.io/v1/metrics
  • x-honeycomb-team header for API key.
• (Optional) Configure traces exporter to use:
  • OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=https://api.honeycomb.io/v1/traces
• Add basic metrics (HTTP request count, latency, error count).
• (Optional) Add traces for key user flows.
• Add environment variable documentation to README.
• Test and verify data in Honeycomb.

References

• Honeycomb OpenTelemetry docs
• OpenTelemetry JS SDK

Notes

• Prefer HTTP/Protobuf for compatibility.
• Use environment variables for endpoint and API key.