Finds candidates in the company whose email address matches email_address, searching company-wide across all positions rather than within a single job. Matching is exact on the normalized (lowercased, trimmed) email address — not a partial or fuzzy text search.

Returns an array with one lightweight entry per matching candidate. Each entry contains only the candidate's _id, name, and creation_date, plus the position the candidate is associated with. This is a much smaller shape than the standard candidate list object — the other ListCandidate fields (email_address, stage, source, resume, tags, etc.) are not returned by this endpoint.

The email_address query parameter is required; requests without it return 400.