With requires-python >=3.11, tomllib is always available, so the
version-conditional tomli imports are dead code.
- import tomllib directly in the cli and core config loaders, the
mcp_server and platform_api config validators, dev_install.py, and
the cli and cookiecutter tests; dev_install.py no longer pip-installs
tomli on the fly
- drop the tomli>=2.0; python_version<'3.11' dependency from cli, core,
mcp_server, and platform_api, plus platform_api's backport comment
- raise the fake-extension fixtures in cli/conftest.py,
core/integration/conftest.py, and the charting test metadata to
>=3.11
- relock cli, core, mcp_server, and platform_api; only the tomli
requires-dist entry is removed and resolution markers are reordered,
no package versions change
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