P28: DAB Modernization — Python wheel tasks, databricks-bundles, schema cleanup

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Modernized Databricks Asset Bundle: Python wheel tasks replace SQL transpilation, databricks-bundles 0.295.0 typed resource loader replaces 375-line YAML generator, 13 pipeline-derived schemas (was 34), all 3 CI backends at parity with skinny-install. 10 issues, CI+deploy verified.

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