Add 6 real-world use cases from YouTube creator workflow

- YouTube Content Pipeline: Automated video idea scouting with X/Twitter integration
- Personal CRM: Contact discovery and meeting prep automation
- AI Earnings Tracker: Tech earnings monitoring and summaries
- Knowledge Base (RAG): Searchable repository of saved content
- Health & Symptom Tracker: Food and symptom logging with pattern analysis
- Multi-Channel Assistant: Unified interface across Telegram, Slack, Google Workspace

All use cases verified in daily production use by @matthewberman

usecases/knowledge-base-rag.md

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+# Personal Knowledge Base (RAG)
+
+You read articles, tweets, and watch videos all day but can never find that one thing you saw last week. Bookmarks pile up and become useless.
+
+This workflow builds a searchable knowledge base from everything you save:
+
+• Drop any URL into Telegram or Slack and it auto-ingests the content (articles, tweets, YouTube transcripts, PDFs)
+• Semantic search over everything you've saved: "What did I save about agent memory?" returns ranked results with sources
+• Feeds into other workflows — e.g., the video idea pipeline queries the KB for relevant saved content when building research cards
+
+## Skills you Need
+
+- [knowledge-base](https://clawhub.ai) skill (or build custom RAG with embeddings)
+- `web_fetch` (built-in)
+- Telegram topic or Slack channel for ingestion
+
+## How to Set it Up
+
+1. Install the knowledge-base skill from ClawdHub.
+2. Create a Telegram topic called "knowledge-base" (or use a Slack channel).
+3. Prompt OpenClaw:
+```text
+When I drop a URL in the "knowledge-base" topic:
+1. Fetch the content (article, tweet, YouTube transcript, PDF)
+2. Ingest it into the knowledge base with metadata (title, URL, date, type)
+3. Reply with confirmation: what was ingested and chunk count
+
+When I ask a question in this topic:
+1. Search the knowledge base semantically
+2. Return top results with sources and relevant excerpts
+3. If no good matches, tell me
+
+Also: when other workflows need research (e.g., video ideas, meeting prep), automatically query the knowledge base for relevant saved content.
+```
+
+4. Test it by dropping a few URLs and asking questions like "What do I have about LLM memory?"