doc: Python support policy — drop EOL versions over contorting code

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -27,6 +27,10 @@ python -m setuptools_scm         # print the version the build will get
 - **Lint is not currently clean on `main`.** black wants to reformat 2 files, isort flags 3, and flake8 reports W391 and W503. Keep unrelated reformatting out of feature diffs.
 - Tests cover only `cfg` (ConfigObj fixtures live in `tests/cfg/`) plus a CommandTree constructor smoke test. `tests/test_log.py` is empty.
 
+## Python support policy
+
+`requires-python` is `>=3.8`, and the claim should match what CI actually tests. When an end-of-life Python version starts failing, drop it: raise `requires-python` and remove its CI lane. Don't add compat shims, version branches or contorted code just to keep it working. Clean code matters more than supporting EOL runtimes. Users on old Pythons keep the older releases on PyPI.
+
 ## Architecture
 
 Package layout: `_bootstrap.py`, `_util.py`, `cfg.py`, `log.py`, `cli.py` and `app_container.py`. `__init__.py` re-exports the public names explicitly.

app_skellington/_version.py

@@ -1,20 +1,24 @@
-# file generated by setuptools-scm
+# file generated by vcs-versioning
 # don't change, don't track in version control
+from __future__ import annotations
 
-__all__ = ["__version__", "__version_tuple__", "version", "version_tuple"]
-
-TYPE_CHECKING = False
-if TYPE_CHECKING:
-    from typing import Tuple, Union
-
-    VERSION_TUPLE = Tuple[Union[int, str], ...]
-else:
-    VERSION_TUPLE = object
+__all__ = [
+    "__version__",
+    "__version_tuple__",
+    "version",
+    "version_tuple",
+    "__commit_id__",
+    "commit_id",
+]
 
 version: str
 __version__: str
-__version_tuple__: VERSION_TUPLE
-version_tuple: VERSION_TUPLE
+__version_tuple__: tuple[int | str, ...]
+version_tuple: tuple[int | str, ...]
+commit_id: str | None
+__commit_id__: str | None
 
-__version__ = version = "0.3.0.dev7+gd155176.d20250223"
-__version_tuple__ = version_tuple = (0, 3, 0, "dev7", "gd155176.d20250223")
+__version__ = version = '0.3.0.dev10+gda9568b4f.d20261005'
+__version_tuple__ = version_tuple = (0, 3, 0, 'dev10', 'gda9568b4f.d20261005')
+
+__commit_id__ = commit_id = 'gda9568b4f'