* ncmec: auto-populate priorCTReports, originalFileName, fileRelevance Closes three code-gap rows from the field-coverage audit on #843, all auto-populated from data coop already has so no adopter configuration is needed: - `personOrUserReported.priorCTReports[]`: query `ncmec_reporting.ncmec_reports` for accepted (`is_test=false`) report IDs for the same reported user, ordered most-recent-first. Skipped for exttest submissions since prod and test report IDs don't cross-reference. - `fileDetails.originalFileName`: derive from the media URL's pathname (decoded last segment). Webhook-supplied `additionalInfo.fileName` wins when present; URL-derived fills the gap for adopters without an additional-info webhook. - `fileDetails.fileRelevance`: default to `'Reported'` since `submitReport`'s current call path only iterates over reviewer-flagged media. Input slot accepts `'Supplemental Reported'` for future use. Touch points: - `NcmecReportingService.getPriorCTReportIds`: new query method. - `BuildSubmitReportObjectInput.priorCTReports`: new input slot; `buildSubmitReportObject` renders inside `personOrUserReported` after `ipCaptureEvent` per XSD insertion order. - `BuildFileDetailsObjectInput.{originalFileName,fileRelevance}`: new input slots; `buildFileDetailsObject` renders them in their XSD positions (3rd and 8th). - `deriveOriginalFileNameFromUrl`: exported helper; `#upload` uses it to populate `originalFileName` from `media.url` before calling `buildFileDetailsObject`. No migration; no GraphQL/SDL change; no client change. Purely additive server behavior: existing reports gain three new elements, no existing elements change. Tests: - `deriveOriginalFileNameFromUrl` (new describe block): decoding, query/fragment stripping, unparseable URLs, malformed percent-encoding fallback. - `buildFileDetailsObject` (extended): updated minimum-envelope and XSD-order expectations for the new elements; new cases for `fileRelevance` default+override and `originalFileName` emit/omit. - `buildSubmitReportObject` (new describe block): `priorCTReports` populates in the right XSD position; omits when empty or unset. All 69 NCMEC unit tests pass locally. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * ncmec: log fallback paths in deriveOriginalFileNameFromUrl Surfaces each of the four fallback cases (unparseable URL, empty pathname, empty decoded segment, decode failure) via `ncmecDebugLog` so operators can triage unexpected media URL shapes under `NCMEC_DEBUG=1`. Addresses review nit on #855. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>