Add sample-scope classification (scope + scope_source) to TSE registry: national vs state inferred from declared universe (methodology/sampling plan/municipality), since TSE files all presidential polls under BR regardless of sample reach. Documented in DATA_DICTIONARY as AFOS-derived, auditable, never guessed (unknown when no universe declared).
Enrich TSE poll registry with full public fields (methodology, sampling/weighting design, statistician/CONRE, cost) + link results polls via tse_registration
