feat: implement pipeline feature for automated workflow steps

- Introduced a new pipeline service to manage custom workflow steps that execute after a feature is marked "In Progress".
- Added API endpoints for configuring, saving, adding, updating, deleting, and reordering pipeline steps.
- Enhanced the UI to support pipeline settings, including a dialog for managing steps and integration with the Kanban board.
- Updated the application state management to handle pipeline configurations per project.
- Implemented dynamic column generation in the Kanban board to display pipeline steps between "In Progress" and "Waiting Approval".
- Added documentation for the new pipeline feature, including usage instructions and configuration details.

This feature allows for a more structured workflow, enabling automated processes such as code reviews and testing after feature implementation.

apps/ui/src/components/views/board-view/hooks/use-board-column-features.ts

@@ -23,7 +23,8 @@ export function useBoardColumnFeatures({
 }: UseBoardColumnFeaturesProps) {
   // Memoize column features to prevent unnecessary re-renders
   const columnFeaturesMap = useMemo(() => {
-    const map: Record<ColumnId, Feature[]> = {
+    // Use a more flexible type to support dynamic pipeline statuses
+    const map: Record<string, Feature[]> = {
       backlog: [],
       in_progress: [],
       waiting_approval: [],
@@ -76,31 +77,56 @@ export function useBoardColumnFeatures({
         matchesWorktree = featureBranch === effectiveBranch;
       }
 
+      // Use the feature's status (fallback to backlog for unknown statuses)
+      const status = f.status || 'backlog';
+
+      // IMPORTANT:
+      // Historically, we forced "running" features into in_progress so they never disappeared
+      // during stale reload windows. With pipelines, a feature can legitimately be running while
+      // its status is `pipeline_*`, so we must respect that status to render it in the right column.
       if (isRunning) {
-        // Only show running tasks if they match the current worktree
-        if (matchesWorktree) {
+        if (!matchesWorktree) return;
+
+        if (status.startsWith('pipeline_')) {
+          if (!map[status]) map[status] = [];
+          map[status].push(f);
+          return;
+        }
+
+        // If it's running and has a known non-backlog status, keep it in that status.
+        // Otherwise, fallback to in_progress as the "active work" column.
+        if (status !== 'backlog' && map[status]) {
+          map[status].push(f);
+        } else {
           map.in_progress.push(f);
         }
-      } else {
-        // Otherwise, use the feature's status (fallback to backlog for unknown statuses)
-        const status = f.status as ColumnId;
+        return;
+      }
 
-        // Filter all items by worktree, including backlog
-        // This ensures backlog items with a branch assigned only show in that branch
-        if (status === 'backlog') {
-          if (matchesWorktree) {
-            map.backlog.push(f);
-          }
-        } else if (map[status]) {
-          // Only show if matches current worktree or has no worktree assigned
-          if (matchesWorktree) {
-            map[status].push(f);
-          }
-        } else {
-          // Unknown status, default to backlog
-          if (matchesWorktree) {
-            map.backlog.push(f);
+      // Not running: place by status (and worktree filter)
+      // Filter all items by worktree, including backlog
+      // This ensures backlog items with a branch assigned only show in that branch
+      if (status === 'backlog') {
+        if (matchesWorktree) {
+          map.backlog.push(f);
+        }
+      } else if (map[status]) {
+        // Only show if matches current worktree or has no worktree assigned
+        if (matchesWorktree) {
+          map[status].push(f);
+        }
+      } else if (status.startsWith('pipeline_')) {
+        // Handle pipeline statuses - initialize array if needed
+        if (matchesWorktree) {
+          if (!map[status]) {
+            map[status] = [];
           }
+          map[status].push(f);
+        }
+      } else {
+        // Unknown status, default to backlog
+        if (matchesWorktree) {
+          map.backlog.push(f);
         }
       }
     });
@@ -147,7 +173,7 @@ export function useBoardColumnFeatures({
 
   const getColumnFeatures = useCallback(
     (columnId: ColumnId) => {
-      return columnFeaturesMap[columnId];
+      return columnFeaturesMap[columnId] || [];
     },
     [columnFeaturesMap]
   );