feat(13): reference posix-sdc three ways for seamless multi-machine dev

Wire the posix-sdc dependency as a triplet:
- pyproject declares the abstract posix-sdc[hub], so the trainer's --hub path can
  reach the Hub (huggingface_hub) wherever sekft is installed;
- Pipfile [packages] pulls the published wheel from the private index;
- Pipfile [dev-packages] pulls the git develop branch for develop-time work.

Commit Pipfile.lock so the dependency surface and its lock land together.

Pipfile

@@ -3,11 +3,14 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 name = "pypi"
 
+[[source]]
+url = "https://pypi.code.tiararodney.com/root/byteb4rb1e/+simple/"
+verify_ssl = true
+name = "pypicodetiararodney"
+
 [packages]
 "tiararodney.sekft" = {file = ".", editable = true}
-# Local editable override of the posix-sdc dependency declared (abstractly) in
-# pyproject.toml, so the dataset/factory is developed side by side.
-"tiararodney.posix-sdc" = {path = "../posix-sdc", editable = true}
+"tiararodney.posix-sdc" = {version = "*", index = "pypicodetiararodney", extras=  ["hub"]}
 
 [dev-packages]
 tox = "*"
@@ -18,6 +21,7 @@ twine = "*"
 setuptools-scm = "~=8.2.0"
 pypi-attestations = "*"
 autopep8 = "*"
+"tiararodney.posix-sdc" = {ref = "develop", git = "https://git.code.tiararodney.com/tiara/posix-sdc.git", extras = ["hub"]}
 
 [requires]
 python_version = "3"

pyproject.toml

@@ -31,7 +31,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-  "tiararodney.posix-sdc",
+  "tiararodney.posix-sdc[hub]",
 ]
 dynamic = ["version"]
 requires-python = ">=3.9"