docs: define initial Seriatim installation feature

requirements-dev.txt

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+# Fully resolved workspace development toolchain for Python 3.14 on Ubuntu
+# 26.04. Regenerate deliberately when upgrading ansible-core or ansible-lint.
+ansible-compat==26.8.0
+ansible-core==2.21.3
+ansible-lint==26.8.0
+attrs==26.1.0
+black==26.5.1
+bracex==3.0.1
+cffi==2.1.1
+click==8.5.0
+cryptography==50.0.1
+distro==1.9.0
+filelock==3.32.5
+Jinja2==3.1.6
+jsonschema==4.26.0
+jsonschema-specifications==2025.9.1
+MarkupSafe==3.0.3
+mypy_extensions==1.1.0
+packaging==26.3
+pathspec==1.1.1
+platformdirs==4.11.7
+pycparser==3.0
+pytokens==0.4.1
+PyYAML==6.0.3
+referencing==0.37.0
+resolvelib==1.2.1
+rpds-py==2026.6.3
+ruamel.yaml==0.19.1
+subprocess-tee==0.4.2
+wcmatch==11.0.1
+yamllint==1.38.0