First-party Agent Forge capability plugin: a per-session bounded lifecycle
event journal with deterministic product metrics, a problem-report exporter,
and — when the host injects the trace adapter service (api.trace) — the
agent-forge/trace.v1 session trace file sink with optional OTLP/HTTP+JSON
export (OTEL_EXPORTER_OTLP_ENDPOINT).
Subscribes through the public lifecycle directory; event definitions are
host-owned (the host's bootstrap defines the catalog before plugins load).
Reports persist through the public OutputArtifactAPI when the host declares
output-artifacts.
Publishes as @ai-agent-forge/plugin-observability; the workspace name is
@agent-forge/plugin-observability.