Validate model existence in constructor to fail fast with clear errors#826

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Commits on Oct 27, 2025

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Add model validation in constructor with tests

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srikanthbachala20
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Apply code formatting and minor bug fix

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srikanthbachala20
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Add validate parameter to skip validation in internal Model creation

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srikanthbachala20
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Add mock-based unit tests for model validation

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srikanthbachala20
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Simplify mock tests based on code review feedback

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srikanthbachala20
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Use assert_called_once for better test assertions

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srikanthbachala20
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