docs(registry): seed 10 examples + 5 skills (LI SDD M3.1 + M3.3)

對應 .agents/specs/llm-interface/ Milestone 3.1 + 3.3。

registry/examples/ — 10 個可直接 push 的 workflow 範本：
  starter:    webhook-to-http
  common:     cron-watcher, llm-classify, rag-search-answer, daily-digest
  external:   email-summary (gmail+claude+telegram), pdf-to-blocks,
              github-issue-bot
  advanced:   parallel-fanout (trigger_workflow fan-out),
              error-retry (try_catch+wait pattern)

  每個含：workflow.yaml（可直接 push）+ description.md（解決什麼問題 /
  改成你自己的 / 學到什麼）+ tags.json（搜尋用）

registry/skills/ — 5 個 AI playbook（markdown）：
  build_watcher_workflow            — cron + filter + trigger 模式
  debug_paused_workflow             — claude_api callback paused 怎麼追
  migrate_http_to_trigger_workflow  — 從 self-fetch 換 trigger_workflow
  rag_with_arcrun                   — KBDB + claude_api 組裝 RAG
  add_new_wasm_component            — TinyGo 寫 + 部署全流程

兩者差異：
  examples = 可直接拿來改的 YAML
  skills = 面對 X 問題該怎麼想 + 該用哪個 example

兩者後續：CI 自動同步進 KBDB（type=workflow-example / type=agent-skill），
MCP arcrun_search_examples / arcrun_list_skills 走 KBDB semantic search。
（CI sync 是 M3.4 工作）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

registry/examples/daily-digest/workflow.yaml

@@ -0,0 +1,62 @@
+name: daily_digest
+description: 每天早上聚合多源資料 (KBDB / RSS / GitHub trending) → claude 摘要 → telegram
+
+flow:
+  - "morning_cron >> ON_SUCCESS >> fetch_kbdb_yesterday"
+  - "morning_cron >> ON_SUCCESS >> fetch_rss"
+  - "morning_cron >> ON_SUCCESS >> fetch_github_trending"
+  - "fetch_kbdb_yesterday >> ON_SUCCESS >> compose_digest"
+  - "fetch_rss >> ON_SUCCESS >> compose_digest"
+  - "fetch_github_trending >> ON_SUCCESS >> compose_digest"
+  - "compose_digest >> ON_SUCCESS >> push_digest"
+
+config:
+  morning_cron:
+    component: cron
+    cron_expr: "0 0 * * *"   # UTC 00:00 = 台灣 08:00
+
+  fetch_kbdb_yesterday:
+    component: kbdb_get
+    api_key: "{{api_key}}"
+    type: "note"
+    source: "km-writer-direct"
+    limit: 50
+
+  fetch_rss:
+    component: http_request
+    url: "https://hnrss.org/frontpage?count=10"
+    method: GET
+
+  fetch_github_trending:
+    component: http_request
+    url: "https://api.github.com/search/repositories?q=created:>{{_yesterday}}+stars:>500&sort=stars&order=desc&per_page=5"
+    method: GET
+    headers:
+      Accept: "application/vnd.github+json"
+
+  # compose 收三條 fan-in（cypher-executor 自動等三個 source 都完成才跑）
+  compose_digest:
+    component: claude_api
+    timeout_ms: 60000
+    _recipe_output_format: text
+    prompt: |
+      整理 leo 今天的「晨間訊息摘要」。三部分各取重點 5-8 條：
+
+      ## 我昨天寫的（KBDB notes）
+      {{fetch_kbdb_yesterday.blocks}}
+
+      ## Hacker News
+      {{fetch_rss.data}}
+
+      ## GitHub 熱門新 repo
+      {{fetch_github_trending.data}}
+
+      格式：markdown bullets，每條 < 30 字，標明來源。
+
+  push_digest:
+    component: telegram
+    chat_id: "{{secret.LEO_TELEGRAM_CHAT_ID}}"
+    text: |
+      ☀️ 早安 {{_today}}
+
+      {{compose_digest.data.text}}