Evidence trail for the rc_* mapping in the prior commit: real value_counts()
over the 7 MI report-card columns, confirming the 5-value grade vocabulary
and that 'Achievement'/'Safeguarding standards' match by exact string only
(no legacy OEIF column accidentally consumed).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB
DfE never published school-level KS2 2021/22 data publicly (confirmed via
EES release notes and by walking the Compare School Performance download
wizard, which has no ks2 checkbox for 2021-2022, same as the COVID-cancelled
2020-2021 year). No archive exists to verify column headers against or
upload to the filebrowser; Task 6 is blocked at the source-data level.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB
