Add native Klein weights v1 & v2 (improved identity + stability)

Native PuLID weights for FLUX.2 Klein.

Includes two trained versions:
- v1: stable and consistent
- v2: improved identity and variation

Both versions provide strong identity preservation with reduced artifacts.

Recommended strength:
- 1.0 (normal)
- 1.4 (recommended)

Use with:
https://github.com/iFayens/ComfyUI-PuLID-Flux2

pulid_flux2_klein_v1.safetensors

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+version https://git-lfs.github.com/spec/v1
+oid sha256:5fe643927aa398f0ffefa4f9796675c2c7d116e78aa96b2416d4d0f54c63fc10
+size 1364389800

pulid_flux2_klein_v2.safetensors

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d5d291cb054eb6eceb25e3b46eff8f05f7b58f8f19a89ec76ba730a6ba8935bb
+size 1364389800