partition strategy: update template repo to assign and build properly using transformations endpoint

[jeff-dude]

No description provided.

[cursor]

PR Summary

Updates partitioning guidance and templates to use properties = { "partitioned_by": ... } and clarifies unique key requirements for partitioned incremental models.

• Rewrites partitioning docs to replace partition_by with properties.partitioned_by, adding daily/monthly/event examples and a clear “do/don’t” example for including partition columns in unique_key
• Adds properties = { "partitioned_by": "ARRAY['block_date']" } to model templates (append, delete+insert, merge, table)
• Expands best-practices docs in .cursor/rules/dbt-best-practices.mdc and docs/dbt-best-practices.md with concise examples for partitioned table/incremental models

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[meny3437-blip]

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