v1.4.2 — Contextual dialogue and reference fixes

Standalone version 1.4.2. Includes a verified self-contained Linux x64 package, updated English and European Portuguese guides, and guarded fixes for contextual agreement, formal address, clitics, natural dialogue, reference-confirmed vocabulary and interrogative accents. Validation: 2,960 tests passed, 7 optional model tests skipped; all 756 cue timings preserved in a private local validation corpus. No subtitle corpus files are included. Official Subtitle Edit package versions are assigned separately upstream.