Add OSOP workflow example — RAG pipeline in portable format

[Archie0125]

Summary

• Adds a portable OSOP (Open Standard for Orchestration Protocols) workflow definition for a typical Haystack RAG pipeline
• Includes a .osop YAML file describing the pipeline (query embedding, vector retrieval, prompt building, answer generation) and a README explaining the mapping to Haystack components
• Files are additive only — no existing files modified

What is OSOP?

OSOP is a YAML-based standard for describing multi-step workflows in a tool-agnostic way — like OpenAPI, but for workflows. A single .osop file can be validated, visualized, and used as a portable reference across different orchestration tools.

Files Added

• examples/osop-rag-pipeline/haystack-rag-pipeline.osop — The workflow definition
• examples/osop-rag-pipeline/README.md — Explanation with Haystack component mapping

Test plan

• Files are valid YAML
• No existing files modified
• README includes clear mapping between OSOP nodes and Haystack components

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