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Squash the 12 goose migrations into one 00001_baseline.sql (there is no prod data; verified schema-identical to the chain via a pg_dump diff + the green integration suite) and rename the game-variant labels english/russian_scrabble/erudit -> scrabble_en/scrabble_ru/erudit_ru across the backend, the FlatBuffers wire values and the UI. dawg filenames and the Go enum identifiers are unchanged; the i18n display keys are kept. Adds PRERELEASE.md (the R1-R7 pre-release tracker), linked from CLAUDE.md. Contour DB wipe and the scrabble-dictionary tidy are follow-ups.