R1: schema & naming reset — squash migrations, rename variants

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.

gateway/internal/transcode/transcode_alphabet_test.go

@@ -21,7 +21,7 @@ func TestGameStateIncludesAlphabet(t *testing.T) {
 		if got := r.URL.Query().Get("include_alphabet"); got != "true" {
 			t.Errorf("include_alphabet query = %q, want true", got)
 		}
-		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"english","status":"active","players":2,"to_move":0,"seats":[]},"seat":0,"rack":[0,255],"bag_len":50,"hints_remaining":0,"alphabet":[{"index":0,"letter":"a","value":1},{"index":1,"letter":"b","value":3}]}`))
+		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"scrabble_en","status":"active","players":2,"to_move":0,"seats":[]},"seat":0,"rack":[0,255],"bag_len":50,"hints_remaining":0,"alphabet":[{"index":0,"letter":"a","value":1},{"index":1,"letter":"b","value":3}]}`))
 	})
 	defer cleanup()
 
@@ -60,7 +60,7 @@ func TestGameStateOmitsAlphabetByDefault(t *testing.T) {
 		if r.URL.Query().Get("include_alphabet") == "true" {
 			t.Error("include_alphabet should be unset")
 		}
-		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"english","status":"active","players":2,"to_move":0,"seats":[]},"seat":0,"rack":[2,0,19],"bag_len":50,"hints_remaining":0}`))
+		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"scrabble_en","status":"active","players":2,"to_move":0,"seats":[]},"seat":0,"rack":[2,0,19],"bag_len":50,"hints_remaining":0}`))
 	})
 	defer cleanup()
 

gateway/internal/transcode/transcode_social_test.go

@@ -153,7 +153,7 @@ func TestInvitationCreateRoundTrip(t *testing.T) {
 		if r.URL.Path != "/api/v1/user/invitations" {
 			t.Errorf("unexpected path %q", r.URL.Path)
 		}
-		_, _ = w.Write([]byte(`{"id":"i-1","inviter":{"account_id":"u-1","display_name":"Me"},"invitees":[{"account_id":"inv-1","display_name":"Friend","seat":1,"response":"pending"}],"variant":"english","turn_timeout_secs":86400,"hints_allowed":true,"hints_per_player":1,"dropout_tiles":"remove","status":"pending","expires_at_unix":42}`))
+		_, _ = w.Write([]byte(`{"id":"i-1","inviter":{"account_id":"u-1","display_name":"Me"},"invitees":[{"account_id":"inv-1","display_name":"Friend","seat":1,"response":"pending"}],"variant":"scrabble_en","turn_timeout_secs":86400,"hints_allowed":true,"hints_per_player":1,"dropout_tiles":"remove","status":"pending","expires_at_unix":42}`))
 	})
 	defer cleanup()
 
@@ -165,7 +165,7 @@ func TestInvitationCreateRoundTrip(t *testing.T) {
 	fb.CreateInvitationRequestStartInviteeIdsVector(b, 1)
 	b.PrependUOffsetT(inviteeID)
 	ids := b.EndVector(1)
-	variant := b.CreateString("english")
+	variant := b.CreateString("scrabble_en")
 	dropout := b.CreateString("remove")
 	fb.CreateInvitationRequestStart(b)
 	fb.CreateInvitationRequestAddInviteeIds(b, ids)
@@ -181,7 +181,7 @@ func TestInvitationCreateRoundTrip(t *testing.T) {
 		t.Fatalf("handler: %v", err)
 	}
 	inv := fb.GetRootAsInvitation(payload, 0)
-	if string(inv.Id()) != "i-1" || inv.InviteesLength() != 1 || string(inv.Variant()) != "english" {
+	if string(inv.Id()) != "i-1" || inv.InviteesLength() != 1 || string(inv.Variant()) != "scrabble_en" {
 		t.Fatalf("invitation decoded wrong: id=%q invitees=%d variant=%q", inv.Id(), inv.InviteesLength(), inv.Variant())
 	}
 	if iv := inv.Inviter(nil); iv == nil || string(iv.DisplayName()) != "Me" {

gateway/internal/transcode/transcode_test.go

@@ -59,7 +59,7 @@ func TestGameStateRoundTripForwardsUserID(t *testing.T) {
 		if r.URL.Path != "/api/v1/user/games/g-1/state" {
 			t.Errorf("unexpected path %q", r.URL.Path)
 		}
-		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"english","status":"active","players":2,"to_move":1,"seats":[{"seat":0,"account_id":"u-7","score":5}]},"seat":0,"rack":[0,1],"bag_len":80,"hints_remaining":1}`))
+		_, _ = w.Write([]byte(`{"game":{"id":"g-1","variant":"scrabble_en","status":"active","players":2,"to_move":1,"seats":[{"seat":0,"account_id":"u-7","score":5}]},"seat":0,"rack":[0,1],"bag_len":80,"hints_remaining":1}`))
 	})
 	defer cleanup()
 
@@ -81,14 +81,14 @@ func TestGameStateRoundTripForwardsUserID(t *testing.T) {
 		t.Fatalf("state decoded wrong: bag=%d rack=%d hints=%d", st.BagLen(), st.RackLength(), st.HintsRemaining())
 	}
 	game := st.Game(nil)
-	if game == nil || string(game.Id()) != "g-1" || string(game.Variant()) != "english" || game.ToMove() != 1 {
+	if game == nil || string(game.Id()) != "g-1" || string(game.Variant()) != "scrabble_en" || game.ToMove() != 1 {
 		t.Fatalf("nested game decoded wrong: %+v", game)
 	}
 }
 
 func TestEnqueueRoundTripEncodesMatch(t *testing.T) {
 	backend, cleanup := fakeBackend(t, func(w http.ResponseWriter, r *http.Request) {
-		_, _ = w.Write([]byte(`{"matched":true,"game":{"id":"g-9","variant":"english","status":"active","players":2,"to_move":0,"seats":[]}}`))
+		_, _ = w.Write([]byte(`{"matched":true,"game":{"id":"g-9","variant":"scrabble_en","status":"active","players":2,"to_move":0,"seats":[]}}`))
 	})
 	defer cleanup()
 
@@ -96,7 +96,7 @@ func TestEnqueueRoundTripEncodesMatch(t *testing.T) {
 	op, _ := reg.Lookup(transcode.MsgLobbyEnqueue)
 
 	b := flatbuffers.NewBuilder(32)
-	v := b.CreateString("english")
+	v := b.CreateString("scrabble_en")
 	fb.EnqueueRequestStart(b)
 	fb.EnqueueRequestAddVariant(b, v)
 	b.Finish(fb.EnqueueRequestEnd(b))
@@ -191,7 +191,7 @@ func TestGamesListRoundTripDecodesSeatNames(t *testing.T) {
 		if r.URL.Path != "/api/v1/user/games" {
 			t.Errorf("unexpected path %q", r.URL.Path)
 		}
-		_, _ = w.Write([]byte(`{"games":[{"id":"g-1","variant":"english","status":"active","players":2,"to_move":0,"last_activity_unix":1717000000,"seats":[{"seat":0,"account_id":"u-9","display_name":"You","score":10},{"seat":1,"account_id":"a-1","display_name":"Ann","score":7}]}]}`))
+		_, _ = w.Write([]byte(`{"games":[{"id":"g-1","variant":"scrabble_en","status":"active","players":2,"to_move":0,"last_activity_unix":1717000000,"seats":[{"seat":0,"account_id":"u-9","display_name":"You","score":10},{"seat":1,"account_id":"a-1","display_name":"Ann","score":7}]}]}`))
 	})
 	defer cleanup()