story-kit: create 166_story_add_done_column_to_pipeline_board

.story_kit/work/1_upcoming/166_story_add_done_column_to_pipeline_board.md

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+---
+type: story
+title: Add Done column to pipeline board
+---
+
+# Story 166: Add Done column to pipeline board
+
+## User Story
+
+As a developer watching work flow through the pipeline, I want to see a "Done" column on the pipeline board showing recently completed work, so I can see items that have finished without them disappearing immediately.
+
+## Description
+
+Now that `5_done` auto-sweeps to `6_archived` after 4 hours (story 151), the Done stage stays small enough to display. Add a "Done" column to the pipeline board above "To Merge", showing work items from `5_done/`.
+
+The column should render similarly to other pipeline columns, showing the story/bug title and any relevant metadata.
+
+## Key files
+
+- `frontend/src/components/` — pipeline board component(s)
+- `server/src/http/workflow.rs` — API that returns pipeline state (may need to include `5_done` items)
+
+## Acceptance Criteria
+
+- [ ] Pipeline board shows a "Done" column with items from `5_done/`
+- [ ] Items disappear from the Done column when they are auto-swept to `6_archived`
+- [ ] Column updates in real-time via existing WebSocket events
+- [ ] All tests pass