Visual completion indicator for task summaries (green border/box)

Problem

When Claude finishes a multi-step task, the completion summary blends into the rest of the conversation output. There's no visual signal that says "this task is done, here's what happened." Users have to scan to find where the result starts.

Proposed Solution

Wrap task-completion summaries in a visually distinct container — a bordered box (ideally green, signaling success) around the final summary block. This would include the headline and any sub-bullets.

Mockup (terminal)

┌─────────────────────────────────────────────────┐
│ ✓ Done. Parallel tasks banner removed from:     │
│   • kanban_data.json (data)                     │
│   • render_dashboard.py (render code + CSS)     │
│   • Both repos pushed                           │
│   • Cloudflare Pages deployed                   │
│                                                 │
│   Local and remote dashboards are clean.        │
└─────────────────────────────────────────────────┘

The border color could follow a simple scheme:

• Green — task completed successfully
• Yellow — completed with warnings
• Red — failed / blocked

How it could work

Claude already structures completion summaries naturally (a bold "Done." line followed by bullet points). The CLI renderer could detect this pattern (or Claude could emit a lightweight marker like <!-- task-complete -->) and wrap it in a bordered box.

Alternatively, a new markdown extension or directive that Claude can emit:

:::success
Done. Parallel tasks banner removed from:
- kanban_data.json (data)
- render_dashboard.py (render code + CSS)  
- Both repos pushed
- Cloudflare Pages deployed
:::

Why this matters

• Scannability: In long sessions with many tasks, users can instantly spot where each result lands
• Cognitive load: Clear visual boundary between "work in progress" and "here's your answer"
• Professional feel: Mirrors how CI/CD dashboards and IDEs signal completion status

Current workaround

Using blockquote formatting (>) for completion summaries, which renders with a left border — functional but not ideal.