Fix unguarded cache clear on provider exit and overly broad compaction item heuristic

- Guard clearTurnStateForSession with shouldApplyThreadLifecycle so a
  replaced provider's session.exited event does not wipe turn caches
  belonging to the new provider's in-progress turn.

- Remove the overly broad 'summary' fallback from looksLikeCompactionItem;
  only compact_summary and compactSummary are specific enough to identify
  compaction items without false positives.

Author: cursoragent

apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.ts

@@ -1147,7 +1147,7 @@ const make = Effect.fn("make")(function* () {
       }
     }
 
-    if (event.type === "session.exited") {
+    if (event.type === "session.exited" && shouldApplyThreadLifecycle) {
       yield* clearTurnStateForSession(thread.id);
     }
 

apps/server/src/provider/handoffSummary.ts

@@ -72,11 +72,7 @@ function looksLikeCompactionItem(value: unknown): boolean {
   if (COMPACTION_TYPE_SNIPPETS.some((snippet) => type.includes(snippet))) {
     return true;
   }
-  return (
-    typeof record.compact_summary === "string" ||
-    typeof record.compactSummary === "string" ||
-    typeof record.summary === "string"
-  );
+  return typeof record.compact_summary === "string" || typeof record.compactSummary === "string";
 }
 
 export function extractCompactionSummaryFromSnapshot(snapshot: {