fix(sdmx_datasets_imf_data): strip stale sdmx key from meta.json (post-#82 manifest contract)

reshape sdmx_datasets_imf_data: entry metadata -> dimensions list

Rebuild sdmx_datasets_imf_data: title-only search surface, ECB title repair, hybrid titles for every agency

strip legacy sdmx meta block (1-250 of 7930)

Add files using upload-large-folder tool