cleanup(session): isolate trajectory inspection

docs/core-data-structures/compaction.md

@@ -22,7 +22,7 @@ These variants are merged inside a `declare module '@deepseek-ai/dsh-session'` b
 
 ## `CompactionResult`
 
-What a successful compaction returns to its caller: the bookkeeping-event seqs, safe summary projection, optional complete provider output, shadowed range and seqs, and estimated token count.
+What a successful compaction returns to its caller: the bookkeeping-event seqs, safe summary projection, shadowed range and seqs, and estimated token count.
 
 ```ts type-equiv
 /** Result of a successful compaction operation. */
@@ -35,8 +35,6 @@ interface CompactionResult {
   endSeq: number
   /** The summary content blocks produced by the backend. */
   summary: ContentBlock[]
-  /** Complete provider output before the backend's safe summary projection. */
-  rawOutput?: ContentBlock[]
   /**
    * The surface-boundary pair that was shadowed: the seqs of the first
    * (`start`) and last (`end`) surface nodes of the replaced range. A