Add chappe wrapped: shareable PNG dashboard with growth-loop attribution

[crimeacs]

Summary

• New top-level command chappe wrapped @channel --period 90d [--lang en|ru] [--out PATH] that renders a 1080×1350 PNG dashboard for the channel plus a ready caption template.
• The PNG carries 'generated by chappe · github.com/crimeacs/chappe' in the footer, so every operator who posts their wrapped image is also doing a quiet referral.
• Wired into onboarding so the first reachable payoff after sync is something the operator can publish to their own channel today, not just JSON.

Why

Today the first real payoff after onboarding is JSON in a terminal. That's good for agents, but it's not something the operator can immediately turn into a post. chappe wrapped closes that gap: 1 command after sync → a finished image + finished caption, ready to publish. Three things compound on that:

1. The operator gets a free, on-topic engagement post for their own channel ('here's what my channel looks like, courtesy of Chappe').
2. The footer references the repo, so curious followers get a clean install path.
3. Chappe's onboarding now ends with a deliverable, not a docs link.

Visual

1080×1350 vertical card, dark theme. Header (channel + period) → 3 big stat tiles (posts, comments, mean fwd/views) → top 3 posts by forwards with id, views, forwards → best-format + sample audience question → footer with Chappe attribution and the repo URL. Cyrillic renders correctly via Arial / DejaVu fallback.

Onboarding wire-up

• bootstrap fastest_path_to_value now surfaces a render_wrapped_dashboard step once the channel has ≥20 local posts. The why field is explicit about the growth loop ('free engagement post that quietly credits Chappe').
• onboard setup_steps.analyze_growth is followed by publish_wrapped_dashboard.

Output shape

{
  "ok": true,
  "channel": "@nn_for_science",
  "period": "90d",
  "lang": "ru",
  "png_path": "/path/to/nn_for_science-90d.png",
  "caption_path": "/path/to/nn_for_science-90d.txt",
  "caption_preview": "📊 chappe-wrapped: @nn_for_science · 90d ...",
  "stats": { "posts": 48, "comments": 921, "mean_forward_rate": 0.01464, "best_format": "photo", "top_posts": [...], "sample_question": "..." },
  "next_commands": [ "chappe draft create @nn_for_science --file <caption.txt>", ... ],
  "growth_hint": "Post this PNG + caption to your own channel..."
}

Test plan

• pytest -q — 41 passed (3 new for wrapped + the existing 38)
• ruff check src/ tests/ — clean
• Smoke-tested live on @nn_for_science: PNG renders, Cyrillic renders, footer attribution lands, caption .txt file is written next to the PNG
• wrapped on an unsynced channel fails with NOT_FOUND and an explicit chappe sync <ch> next_command
• bootstrap --channel @ch after 20 stored posts surfaces the new render_wrapped_dashboard step in fastest_path_to_value

Known limitation

Pillow does not render color emoji glyphs. A '🤖' inside a post's text shows as a placeholder square. Acceptable for v1; can ship an emoji-stripping pre-pass in a follow-up if it becomes a real complaint.

🤖 Generated with Claude Code