huskies: merge 974

server/src/pipeline_state/tests.rs

@@ -993,4 +993,40 @@ fn move_story_merge_to_current_succeeds() {
     );
 }
 
+// ── Story 974: Done → Coding (hotfix) ─────────────────────────────
+
+#[test]
+fn hotfix_requested_from_done_lands_in_coding() {
+    let done = Stage::Done {
+        merged_at: chrono::Utc::now(),
+        merge_commit: sha("abc123"),
+    };
+    let result = transition(done, PipelineEvent::HotfixRequested).unwrap();
+    assert!(
+        matches!(result, Stage::Coding),
+        "Done + HotfixRequested must land in Coding; got: {:?}",
+        result
+    );
+}
+
+#[test]
+fn hotfix_requested_rejected_from_non_done_stages() {
+    for stage in [
+        Stage::Backlog,
+        Stage::Coding,
+        Stage::Qa,
+        Stage::Merge {
+            feature_branch: fb("feature/story-1"),
+            commits_ahead: nz(1),
+        },
+    ] {
+        let result = transition(stage.clone(), PipelineEvent::HotfixRequested);
+        assert!(
+            result.is_err(),
+            "HotfixRequested must be rejected from {:?}",
+            stage
+        );
+    }
+}
+
 // ── ProjectionError Display ─────────────────────────────────────────

server/src/pipeline_state/transition.rs

@@ -74,6 +74,8 @@ pub enum PipelineEvent {
     ReQueuedForQa,
     /// Story 973: user aborts an in-flight merge, sending the story back to Coding.
     MergeAborted,
+    /// Story 974: user re-opens a Done story for a post-merge hotfix, sending it back to Coding.
+    HotfixRequested,
 }
 
 // ── Per-node execution events ───────────────────────────────────────────────
@@ -120,6 +122,7 @@ pub fn event_label(e: &PipelineEvent) -> &'static str {
         PipelineEvent::FixupRequested => "FixupRequested",
         PipelineEvent::ReQueuedForQa => "ReQueuedForQa",
         PipelineEvent::MergeAborted => "MergeAborted",
+        PipelineEvent::HotfixRequested => "HotfixRequested",
     }
 }
 
@@ -316,6 +319,12 @@ pub fn transition(state: Stage, event: PipelineEvent) -> Result<Stage, Transitio
         // ── MergeAborted: Merge → Coding (abort in-flight merge) ─────────
         (Merge { .. }, MergeAborted) => Ok(Coding),
 
+        // ── HotfixRequested: Done → Coding (post-merge hotfix) ───────────
+        // Allows reopening a completed story so a coder can apply a hotfix.
+        // A fresh feature branch is forked from master when auto-assign spawns
+        // the coder.
+        (Done { .. }, HotfixRequested) => Ok(Coding),
+
         // ── MergemasterAttempted: MergeFailure → MergeFailureFinal ─────
         (MergeFailure { reason, .. }, MergemasterAttempted) => Ok(MergeFailureFinal { reason }),
         (MergeFailureFinal { reason }, MergemasterAttempted) => Ok(MergeFailureFinal { reason }),