A human-readable title for a given HTTP status code. This is the single source of truth used by both the factory functions and the Problem Details formatters so the title field never drifts from the produced statusCode.

Keys are every status the framework itself produces — the ones the factories below return AND the ones first-party code brands onto an error with withHttpStatusHint from @setu-ts/common, which reaches this table through the responder seam without passing a factory (413 from the request-size and body-cap refusals, 415 from the form accessor, 501/503/504 from the database, secrets and resilience refusals). A branded status with no row here is served the generic 'Error' title, so test/status-title-coverage.test.ts enumerates the branded statuses from source and fails when one is missing — 415 reached a client as "title": "Error" under 'rfc9457' while the same error read "message": "Unsupported Media Type" under 'default', because every test asserted the brand on the error object and none read the served body.