PIPE-2738/PIPE-2890: Migrate PLUG task docs into CLI docstrings
Add per-task descriptions, figures, QA scoring notes, workflow
details, and WebLog references from the Pipeline User Guide
(PLUG) LaTeX source (sections 9-10) into Google-style docstrings
of 50 CLI wrapper functions across h/, hif/, hifa/, and hsd/.
Add 34 figures referenced by the new docstrings under
docs/source/figures/.
Set napoleon_use_rtype=False in docs/source/conf.py to suppress
redundant return-type rendering.
