Supporting note map

The package still keeps many supporting and historical notes in the flat docs/ tree at the repository root.

Those notes are still useful, but they should be read as lower-priority supporting material rather than as the main user manual.

Current grouped supporting-note entry points

For the atomic line:

• docs/atomic_mean_field_supporting_notes.md
• docs/gaunt_backend_note.md
• docs/atomic_angular_sectorization.md
• docs/atomic_export_consumer_smoke.md
• docs/atomic_export_active_space_validation.md

For the ordinary line:

• docs/ordinary_pgdg_supporting_notes.md
• docs/ordinary_cartesian_ida.md
• docs/ordinary_pgdg_hybrid_consolidation.md

For docs-system history:

• docs/documenter_transition_plan.md
• docs/api_reference_first_pass.md
• docs/documentation_hardening_plan.md

How to use these notes

The recommended reading order is:

1. start in the Manual
2. use the Reference for API details
3. come here only if you need the narrower design and development history

That keeps the user-facing docs surface clear while still preserving the scientific development record.