List SAM.gov exclusions

Per-exclusion SAM.gov debarment / suspension list for an employer.

Each row is one entry from the System for Award Management exclusions list -- the excluding agency, the program / type the exclusion was filed under, dates (activation + termination, when populated), the UEI + CAGE code that link to federal-contracting profiles, and any additional_comments narrative. The aggregate boolean (is_sam_excluded) plus the current top-line exclusion_type and excluding_agency already live on the Employer payload; this endpoint backs them with the full per-exclusion roster, including terminated historical exclusions.

Lookup: SAM source has no canonical employer_id and the address fields don't reliably match across agencies, so name_normalized is the join key. Resolved through employer_profile, then queried against sam_exclusion_detail.

Status semantics: an exclusion with NULL termination_date is currently active; one with a populated termination_date was terminated on that date. Active exclusions surface first (NULLS FIRST ordering on termination_date), then terminated most-recent-first.