Article: Data engineering pipelines with ai-dev-kit

Brief Medium article covering:
- Spark Declarative Pipelines (SDP) from a prompt
- Multi-task Jobs with triggers and dependencies
- Structured Streaming patterns
- Deploying with Databricks Asset Bundles

Relevant skills: databricks-spark-declarative-pipelines, databricks-jobs, databricks-spark-structured-streaming, databricks-bundles

Parent: #339