chore: update dev environment and sync workflow

- Add nil LSP package to devenv.nix
- Add datasets and rich.progress imports to feature_retrieval.py
- Update pyproject.toml ty environment config
- Expand .stignore with cache directories
- Update uv.lock dependency lock
- Update AGENTS.md, adding the content of development environment11

pyproject.toml

@@ -14,7 +14,7 @@ dependencies = [
     "habitat-lab>=0.3.320250127",
     "httpx[socks]>=0.28.1",
     "lancedb>=0.30.1",
-    "marimo[mcp]>=0.21.1",
+    "marimo[mcp]>=0.22.0",
     "matplotlib>=3.10.8",
     "polars[database,numpy,pandas,pydantic]>=1.37.1",
     "pyarrow>=23.0.0",
@@ -38,7 +38,7 @@ dev = [
 ]
 
 [tool.ty.environment]
-python = "/workspace/envs/mini-nav"
+python = "$UV_PROJECT_ENVIRONMENT"
 root = ["./mini-nav", "./notebooks"]
 
 [tool.basedpyright]