chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/dbt-transformation-patterns/SKILL.md

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+---
+name: dbt-transformation-patterns
+description: Master dbt (data build tool) for analytics engineering with model organization, testing, documentation, and incremental strategies. Use when building data transformations, creating data models, or implementing analytics engineering best practices.
+---
+
+# dbt Transformation Patterns
+
+Production-ready patterns for dbt (data build tool) including model organization, testing strategies, documentation, and incremental processing.
+
+## Use this skill when
+
+- Building data transformation pipelines with dbt
+- Organizing models into staging, intermediate, and marts layers
+- Implementing data quality tests and documentation
+- Creating incremental models for large datasets
+- Setting up dbt project structure and conventions
+
+## Do not use this skill when
+
+- The project is not using dbt or a warehouse-backed workflow
+- You only need ad-hoc SQL queries
+- There is no access to source data or schemas
+
+## Instructions
+
+- Define model layers, naming, and ownership.
+- Implement tests, documentation, and freshness checks.
+- Choose materializations and incremental strategies.
+- Optimize runs with selectors and CI workflows.
+- If detailed patterns are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed dbt patterns and examples.