Move `.devx` related deps to `dev` group

pyproject.toml

@@ -39,8 +39,7 @@ msgspec='^0.18.5'  # interchange
 wrapt = "^1.16.0"  # decorators
 colorlog = "^6.8.2"  # logging
 
-# .devx tooling
-stackscope = "^0.2.2"
+# built-in multi-actor `pdb` REPL
 pdbp = "^1.5.0"
 
 
@@ -49,15 +48,19 @@ pdbp = "^1.5.0"
 # 'pyroute2
 
 # ------ - ------
-xontrib-vox = "^0.0.1"
 
 [tool.poetry.group.dev]
 optional = false
 [tool.poetry.group.dev.dependencies]
+# testing
 pytest = "^8.2.0"
 pexpect = "^4.9.0"
 
-# only for xonsh as sh..
+# .devx tooling
+greenback = "^1.2.1"
+stackscope = "^0.2.2"
+
+# (light) xonsh usage/integration
 xontrib-vox = "^0.0.1"
 prompt-toolkit = "^3.0.43"
 xonsh-vox-tabcomplete = "^0.5"