Add MolmoAct2 policy (#3604)

* add molmoact2 policy

* add apache headers to molmoact2 files

* simplify molmoact2 package imports

* align molmoact2 feature validation with eo pattern

* remove molmoact2 processor override from factory

* guard molmoact2 transformers imports

* guard molmoact2 processor transformers import

* add scipy dependency to molmoact2 extra

* use a single molmoact2 action queue

* move molmoact2 config logic into config

* fix molmoact2 hf image key resolution

* load molmoact2 without remote code

* lazy import molmoact2 scipy

* format molmoact2 files

* skip molmoact2 tests without optional deps

* fix molmoact2 pre-commit checks

* validate molmoact2 gripper range

docs/source/_toctree.yml

@@ -59,6 +59,8 @@
     title: π₀-FAST (Pi0Fast)
   - local: pi05
     title: π₀.₅ (Pi05)
+  - local: molmoact2
+    title: MolmoAct2
   - local: eo1
     title: EO-1
   - local: groot