feat: add pixeltable skill for multimodal AI data infrastructure

skills/pixeltable/README.md

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+# Pixeltable
+
+Build multimodal AI applications with Pixeltable -- declarative tables replace LangChain + pandas + vector DB with one system. Automates chunking, embedding, retrieval, tool-calling agents, and 25+ AI provider integrations via computed columns that run on insert.
+
+## Triggers
+
+This skill is activated by the following keywords:
+
+- `pixeltable`
+- `multimodal`
+- `computed columns`
+- `embedding index`
+- `pxt.udf`
+- `similarity search`
+- `RAG pipeline`
+- `video frames`
+- `document chunks`
+
+## What it covers
+
+- Creating tables with multimodal column types (Image, Video, Audio, Document)
+- Computed columns that auto-execute on insert
+- Embedding indexes and similarity search
+- UDFs and query functions
+- Views with iterators (frame extraction, document chunking)
+- 25+ AI provider integrations (OpenAI, Anthropic, Gemini, etc.)
+- FastAPI serving and production patterns
+
+## Links
+
+- [Documentation](https://docs.pixeltable.com/)
+- [GitHub](https://github.com/pixeltable/pixeltable)
+- [Discussions](https://github.com/pixeltable/pixeltable/discussions)