feat: add core observability plugin

README.md

@@ -49,8 +49,8 @@ consistent across frameworks and languages.
   ecosystem components, third-party agent frameworks, provider adapters, or
   direct application code.
 - ⚙️ **Install reusable runtime behavior**: Plugins configure middleware,
-  subscribers, adaptive components, and custom runtime behavior from one shared
-  system.
+  subscribers, adaptive components, observability exporters, and custom runtime
+  behavior from one shared system.
 
 ## What You Get
 
@@ -64,6 +64,9 @@ consistent across frameworks and languages.
 - ✅ **Observability-ready events**: Preserve model metadata, tool call IDs,
   inputs, outputs, scope relationships, and lifecycle timing for downstream
   analysis.
+- ✅ **Built-in observability plugin**: Configure Agent Trajectory Observability
+  Format (ATOF), ATIF, OpenTelemetry, and OpenInference exporters without
+  registering subscribers by hand.
 - ✅ **Extension points for framework authors**: Wrap stable tool and provider
   callbacks while preserving framework-owned scheduling, retries, memory, and
   result handling.

crates/core/README.md

@@ -44,6 +44,9 @@ Node.js bindings mirror the semantics exposed by this crate.
   scope that owns them and clean them up when that scope closes.
 - ✅ **Plugin primitives**: Register reusable runtime behavior configured from
   one shared plugin system.
+- ✅ **Built-in observability plugin**: Configure first-party Agent Trajectory
+  Observability Format (ATOF), ATIF, OpenTelemetry, and OpenInference exporters
+  from the core crate.
 - ✅ **Codec and typed helpers**: Normalize provider requests and responses for
   framework integrations.
 - ✅ **Binding source of truth**: Use the runtime semantics mirrored by the

crates/core/src/observability/mod.rs

@@ -17,3 +17,4 @@ pub mod atof;
 pub mod openinference;
 #[cfg(feature = "otel")]
 pub mod otel;
+pub mod plugin_component;