huskies: merge 867

server/src/pipeline_state/transition.rs

@@ -56,6 +56,10 @@ pub enum PipelineEvent {
     Close,
     /// Manual demotion back to backlog from an active stage.
     Demote,
+    /// Freeze the story at its current stage (suspends pipeline and auto-assign).
+    Freeze,
+    /// Unfreeze the story, restoring it to the stage it was at when frozen.
+    Unfreeze,
 }
 
 // ── Per-node execution events ───────────────────────────────────────────────
@@ -94,6 +98,8 @@ pub fn event_label(e: &PipelineEvent) -> &'static str {
         PipelineEvent::Triage => "Triage",
         PipelineEvent::Close => "Close",
         PipelineEvent::Demote => "Demote",
+        PipelineEvent::Freeze => "Freeze",
+        PipelineEvent::Unfreeze => "Unfreeze",
     }
 }
 
@@ -231,6 +237,17 @@ pub fn transition(state: Stage, event: PipelineEvent) -> Result<Stage, Transitio
             Unblock,
         ) => Ok(Backlog),
 
+        // ── Freeze: any active stage → Frozen(resume_to=current) ────────
+        (stage @ (Upcoming | Backlog | Coding | Qa), Freeze) => Ok(Frozen {
+            resume_to: Box::new(stage),
+        }),
+        (stage @ Merge { .. }, Freeze) => Ok(Frozen {
+            resume_to: Box::new(stage),
+        }),
+
+        // ── Unfreeze: Frozen → resume_to ─────────────────────────────────
+        (Frozen { resume_to }, Unfreeze) => Ok(*resume_to),
+
         // ── Everything else is invalid ──────────────────────────────────
         _ => Err(invalid()),
     }