Add Nav3R global semantic v2 lightweight adapters

Upload accepted bottleneck-64, no-append, grounding-only adapters for seeds 42, 123, and 777. Base MTU3D and Sonata/PTv3 weights and all datasets are excluded.

nav3r_global_semantic_v2_b64_noappend_seed123.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:1cc590fc4280a81b265ddada7831a89f29a72233b849d3a03906a0189110a94e
+size 3948960

nav3r_global_semantic_v2_b64_noappend_seed42.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:5e1f360483acff9b43d4e42ab28faea5b133c4965acc42646912312e101c713b
+size 3948960

nav3r_global_semantic_v2_b64_noappend_seed777.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5c620c3e4722b148f474642a71b7c04f7e0d9de415acc436f6f1f91f8eb89de3
+size 3948960