session-storeとして分離

crates/session-store/src/event_trace.rs

@@ -0,0 +1,21 @@
+//! Debug-only raw stream event recording.
+//!
+//! [`TraceEntry`] captures every LLM stream event verbatim for debugging
+//! and post-hoc analysis. Written to a separate `.trace.jsonl` file,
+//! completely independent of the session log used for state restoration.
+//!
+//! Disabled by default. Enable via `SessionConfig::record_event_trace`.
+
+use llm_worker::llm_client::event::Event;
+use serde::{Deserialize, Serialize};
+
+/// A single trace entry recording a raw stream event.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TraceEntry {
+    /// Timestamp in milliseconds since Unix epoch.
+    pub ts: u64,
+    /// Turn number at the time of recording.
+    pub turn: usize,
+    /// The raw stream event.
+    pub event: Event,
+}