feat(envs): add RoboMME memory-augmented manipulation benchmark

- RoboMMEEnv config with 16 tasks across 4 suites (Counting, Permanence,
  Reference, Imitation)
- Gymnasium wrapper around BenchmarkEnvBuilder (robomme.py)
- Environment factory wiring for env_type="robomme"
- robomme optional dependency in pyproject.toml

Made-with: Cursor

pyproject.toml

@@ -180,6 +180,9 @@ libero_plus = [
     "libero @ git+https://github.com/sylvestf/LIBERO-plus.git@main ; sys_platform == 'linux'",
     "lerobot[scipy-dep]",
 ]
+robomme = [
+    "robomme @ git+https://github.com/RoboMME/robomme_benchmark.git@main ; sys_platform == 'linux'",
+]
 metaworld = ["metaworld==3.0.0", "lerobot[scipy-dep]"]
 
 # All