huskies: merge 1188 story Merge tool results return a summary, not the full gate log (35KB per call)

server/src/agents/pool/pipeline/merge/runner.rs

@@ -217,7 +217,7 @@ impl AgentPool {
                     // retry_count=1 so maybe_inject_gate_failure injects gate output
                     // into --append-system-prompt on the fixup spawn.
                     // transition_to_merge_failure also writes ContentKey::GateOutput.
-                    let display = kind.display_reason();
+                    let display = crate::service::merge::summarize_merge_failure_kind(&kind);
                     let _ =
                         crate::agents::lifecycle::transition_to_merge_failure(sid.as_str(), kind);
                     match crate::agents::lifecycle::move_story_to_stage(&sid, "current") {
@@ -258,7 +258,7 @@ impl AgentPool {
                     // Transition through the state machine (Merge → MergeFailure).
                     // Only send the notification when the stage actually changed; if the
                     // story was already in MergeFailure (self-loop), suppress the duplicate.
-                    let display = kind.display_reason();
+                    let display = crate::service::merge::summarize_merge_failure_kind(&kind);
                     let should_notify = match crate::agents::lifecycle::transition_to_merge_failure(
                         sid.as_str(),
                         kind,
@@ -352,14 +352,26 @@ impl AgentPool {
             merge_result,
             crate::agents::merge::MergeResult::Success { .. }
         ) {
+            let report_path = crate::service::merge::io::write_merge_report(
+                project_root,
+                story_id,
+                merge_result.output(),
+            );
             return Ok(crate::agents::merge::MergeReport {
                 story_id: story_id.to_string(),
                 result: merge_result,
                 worktree_cleaned_up: false,
                 story_archived: false,
+                report_path,
             });
         }
 
+        let report_path = crate::service::merge::io::write_merge_report(
+            project_root,
+            story_id,
+            merge_result.output(),
+        );
+
         let story_archived = crate::agents::lifecycle::move_story_to_done(story_id).is_ok();
 
         // Story 1178: only delete the feature branch once the state transition
@@ -389,6 +401,7 @@ impl AgentPool {
             result: merge_result,
             worktree_cleaned_up,
             story_archived,
+            report_path,
         })
     }
 }