feat(kanban): add feature summary display and agent context info

Enhance Kanban cards to show comprehensive feature information:
- Add feature summary field to display completed work details
- Show agent context info (model, progress, tasks) on cards
- Display tool usage and token consumption metrics
- Add expandable summary dialog for detailed view
- Update prompts to require summary when marking features complete
- Improve UI for waiting_approval and verified states

Modified: kanban-card.tsx, board-view.tsx, feature-loader.js,
mcp-server-factory.js, prompt-builder.js, app-store.ts
Created: agent-context-parser.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

app/src/components/views/board-view.tsx

@@ -404,6 +404,7 @@ export function BoardView() {
         startedAt: f.startedAt,
         imagePaths: f.imagePaths,
         skipTests: f.skipTests,
+        summary: f.summary,
       }));
       await api.writeFile(
         `${currentProject.path}/.automaker/feature_list.json`,