Re-enable SmolVLM (#1648)

* Add SmolVLM2 support wiring and smoke coverage.

Enable SmolVLM/Idefics3 loading through text-generation auto mappings plus pipeline test coverage to validate end-to-end multimodal inference behavior.

* Apply suggestions from code review

Co-authored-by: Joshua Lochner <admin@xenova.com>

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Co-authored-by: Joshua Lochner <admin@xenova.com>

Author: pdufour

packages/transformers/src/models/models.js

@@ -157,6 +157,7 @@ export * from './sapiens/modeling_sapiens.js';
 export * from './segformer/modeling_segformer.js';
 export * from './siglip/modeling_siglip.js';
 export * from './smollm3/modeling_smollm3.js';
+export * from './smolvlm/modeling_smolvlm.js';
 export * from './snac/modeling_snac.js';
 export * from './solar_open/modeling_solar_open.js';
 export * from './speecht5/modeling_speecht5.js';