refactor: rename core-public -> engine-public; fold helpers in; drop shared

Tighten the package model around the determinism invariant: everything the
engine imports must itself be deterministic.

- Rename core-public -> engine-public (package, dir, `engine-public/*` alias,
  all 118 import sites). It is the deterministic public surface the engine
  depends on and that client/server also use.
- Move the pure formatting helpers (renderNumber/renderTroops) from shared
  into engine-public/format — the engine uses them and they're deterministic.
- Drop the now-empty shared package (and its alias). `shared` was intended for
  client/server-shared, engine-forbidden code; there is none yet, so it is
  removed and can be re-added when such code appears.

Final graph: engine-public (leaf) <- engine <- {client, server};
client/server also -> engine-public.

Verified: tsc clean; 1364 + 65 tests pass; prod build succeeds; engine-public
is a leaf; engine has no client/server imports. Lockfile regenerated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/engine/package.json

@@ -6,6 +6,6 @@
   "main": "src/index.ts",
   "types": "src/index.ts",
   "dependencies": {
-    "@openfront/core-public": "*"
+    "@openfront/engine-public": "*"
   }
 }

packages/engine/src/EventBus.ts

@@ -1,7 +1,7 @@
-// Type contracts live in core-public so the public schema layer can reference
+// Type contracts live in engine-public so the public schema layer can reference
 // GameEvent without depending on the engine. Re-exported here for existing
 // `engine/EventBus` consumers.
-import type { EventConstructor, GameEvent } from "core-public/EventBus";
+import type { EventConstructor, GameEvent } from "engine-public/EventBus";
 export type { EventConstructor, GameEvent };
 
 export class EventBus {

packages/engine/src/GameRunner.ts

@@ -28,7 +28,7 @@ import { ErrorUpdate, GameUpdateViewData } from "./game/GameUpdates";
 import { createNationsForGame } from "./game/NationCreation";
 import { loadTerrainMap as loadGameMap } from "./game/TerrainMapLoader";
 import { PseudoRandom } from "./PseudoRandom";
-import { ClientID, GameStartInfo, Turn } from "core-public/Schemas";
+import { ClientID, GameStartInfo, Turn } from "engine-public/Schemas";
 import { simpleHash } from "./Util";
 
 export async function createGameRunner(

packages/engine/src/Util.ts

@@ -1,12 +1,12 @@
 import DOMPurify from "dompurify";
 import { customAlphabet } from "nanoid";
-// The emoji table moved to core-public; re-exported so existing `engine/Util`
+// The emoji table moved to engine-public; re-exported so existing `engine/Util`
 // imports of these symbols keep working.
 export {
   emojiTable,
   flattenedEmojiTable,
   type Emoji,
-} from "core-public/Emojis";
+} from "engine-public/Emojis";
 import { Cell, PlayerType, Unit } from "./game/Game";
 import { GameMap, TileRef } from "./game/GameMap";
 import {
@@ -17,7 +17,7 @@ import {
   PlayerRecord,
   Turn,
   Winner,
-} from "core-public/Schemas";
+} from "engine-public/Schemas";
 
 import {
   TRIBE_NAME_PREFIXES,

packages/engine/src/configuration/Config.ts

@@ -18,8 +18,8 @@ import {
 import { TileRef } from "../game/GameMap";
 import { PlayerLike } from "../game/ReadViews";
 import { UserSettings } from "../game/UserSettings";
-import { GameConfig, TeamCountConfig } from "core-public/Schemas";
-import { NukeType } from "core-public/StatsSchemas";
+import { GameConfig, TeamCountConfig } from "engine-public/Schemas";
+import { NukeType } from "engine-public/StatsSchemas";
 import { assertNever, sigmoid, toInt, within } from "../Util";
 
 declare global {

packages/engine/src/execution/AttackExecution.ts

@@ -1,4 +1,4 @@
-import { renderTroops } from "shared/format";
+import { renderTroops } from "engine-public/format";
 import {
   Attack,
   Difficulty,

packages/engine/src/execution/ExecutionManager.ts

@@ -1,6 +1,6 @@
 import { Execution, Game } from "../game/Game";
 import { PseudoRandom } from "../PseudoRandom";
-import { ClientID, GameID, StampedIntent, Turn } from "core-public/Schemas";
+import { ClientID, GameID, StampedIntent, Turn } from "engine-public/Schemas";
 import { simpleHash } from "../Util";
 import { AllianceExtensionExecution } from "./alliance/AllianceExtensionExecution";
 import { AllianceRejectExecution } from "./alliance/AllianceRejectExecution";

packages/engine/src/execution/NationExecution.ts

@@ -13,7 +13,7 @@ import {
 } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 import { PseudoRandom } from "../PseudoRandom";
-import { GameID } from "core-public/Schemas";
+import { GameID } from "engine-public/Schemas";
 import { assertNever, simpleHash } from "../Util";
 import { NationAllianceBehavior } from "./nation/NationAllianceBehavior";
 import { NationEmojiBehavior } from "./nation/NationEmojiBehavior";

packages/engine/src/execution/NukeExecution.ts

@@ -14,7 +14,7 @@ import { UniversalPathFinding } from "../pathfinding/PathFinder";
 import { ParabolaUniversalPathFinder } from "../pathfinding/PathFinder.Parabola";
 import { PathStatus } from "../pathfinding/types";
 import { PseudoRandom } from "../PseudoRandom";
-import { NukeType } from "core-public/StatsSchemas";
+import { NukeType } from "engine-public/StatsSchemas";
 import { listNukeBreakAlliance } from "./Util";
 
 const SPRITE_RADIUS = 16;

packages/engine/src/execution/SAMMissileExecution.ts

@@ -9,7 +9,7 @@ import {
 import { TileRef } from "../game/GameMap";
 import { PathFinding } from "../pathfinding/PathFinder";
 import { PathStatus, SteppingPathFinder } from "../pathfinding/types";
-import { NukeType } from "core-public/StatsSchemas";
+import { NukeType } from "engine-public/StatsSchemas";
 
 export class SAMMissileExecution implements Execution {
   private active = true;

packages/engine/src/execution/SpawnExecution.ts

@@ -9,7 +9,7 @@ import {
 } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 import { PseudoRandom } from "../PseudoRandom";
-import { GameID } from "core-public/Schemas";
+import { GameID } from "engine-public/Schemas";
 import { simpleHash } from "../Util";
 import { PlayerExecution } from "./PlayerExecution";
 import { TribeExecution } from "./TribeExecution";

packages/engine/src/execution/TradeShipExecution.ts

@@ -1,4 +1,4 @@
-import { renderNumber } from "shared/format";
+import { renderNumber } from "engine-public/format";
 import {
   Execution,
   Game,

packages/engine/src/execution/TransportShipExecution.ts

@@ -1,4 +1,4 @@
-import { renderTroops } from "shared/format";
+import { renderTroops } from "engine-public/format";
 import {
   Execution,
   Game,

packages/engine/src/execution/TribeSpawner.ts

@@ -1,6 +1,6 @@
 import { Game, PlayerInfo, PlayerType } from "../game/Game";
 import { PseudoRandom } from "../PseudoRandom";
-import { GameID } from "core-public/Schemas";
+import { GameID } from "engine-public/Schemas";
 import { simpleHash } from "../Util";
 import { SpawnExecution } from "./SpawnExecution";
 import { TRIBE_NAME_PREFIXES, TRIBE_NAME_SUFFIXES } from "./utils/TribeNames";

packages/engine/src/execution/utils/PlayerSpawner.ts

@@ -1,5 +1,5 @@
 import { Game, PlayerType } from "../../game/Game";
-import { GameID } from "core-public/Schemas";
+import { GameID } from "engine-public/Schemas";
 import { SpawnExecution } from "../SpawnExecution";
 
 export class PlayerSpawner {

packages/engine/src/game/Game.ts

@@ -1,7 +1,7 @@
 import { Config } from "../configuration/Config";
 import { AbstractGraph } from "../pathfinding/algorithms/AbstractGraph";
 import { PathFinder } from "../pathfinding/types";
-import { AllPlayersStats, ClientID } from "core-public/Schemas";
+import { AllPlayersStats, ClientID } from "engine-public/Schemas";
 import { formatPlayerDisplayName } from "../Util";
 import { GameMap, TileRef } from "./GameMap";
 import {
@@ -14,7 +14,7 @@ import { MotionPlanRecord } from "./MotionPlans";
 import { RailNetwork } from "./RailNetwork";
 import { Stats } from "./Stats";
 import { UnitPredicate } from "./UnitGrid";
-// Enums/consts now live in core-public so the public schema layer can use them
+// Enums/consts now live in engine-public so the public schema layer can use them
 // without depending on the engine. Re-exported here so existing
 // `engine/game/Game` imports keep working.
 import {
@@ -30,7 +30,7 @@ import {
   RankedType,
   Trios,
   UnitType,
-} from "core-public/game/GameTypes";
+} from "engine-public/game/GameTypes";
 export {
   AllPlayers,
   Difficulty,

packages/engine/src/game/GameImpl.ts

@@ -1,10 +1,10 @@
-import { renderNumber } from "shared/format";
+import { renderNumber } from "engine-public/format";
 import { Config } from "../configuration/Config";
 import { SharedWaterCache } from "../execution/nation/SharedWaterCache";
 import { AbstractGraph } from "../pathfinding/algorithms/AbstractGraph";
 import { PathFinder } from "../pathfinding/types";
-import { AllPlayersStats, ClientID, Winner } from "core-public/Schemas";
-import { ATTACK_INDEX_SENT } from "core-public/StatsSchemas";
+import { AllPlayersStats, ClientID, Winner } from "engine-public/Schemas";
+import { ATTACK_INDEX_SENT } from "engine-public/StatsSchemas";
 import { simpleHash } from "../Util";
 import { AllianceImpl } from "./AllianceImpl";
 import { AllianceRequestImpl } from "./AllianceRequestImpl";

packages/engine/src/game/GameUpdates.ts

@@ -1,4 +1,4 @@
-import { AllPlayersStats, ClientID, Winner } from "core-public/Schemas";
+import { AllPlayersStats, ClientID, Winner } from "engine-public/Schemas";
 import {
   EmojiMessage,
   GameUpdates,

packages/engine/src/game/NationCreation.ts

@@ -1,5 +1,5 @@
 import { PseudoRandom } from "../PseudoRandom";
-import { GameStartInfo } from "core-public/Schemas";
+import { GameStartInfo } from "engine-public/Schemas";
 import {
   Cell,
   GameMapSize,

packages/engine/src/game/PlayerImpl.ts

@@ -1,5 +1,5 @@
 import { PseudoRandom } from "../PseudoRandom";
-import { ClientID } from "core-public/Schemas";
+import { ClientID } from "engine-public/Schemas";
 import {
   assertNever,
   findClosestBy,

packages/engine/src/game/ReadViews.ts

@@ -10,7 +10,7 @@
 // Player-vs-PlayerView / Unit-vs-UnitView distinction.
 import { Player, type PlayerID, Unit } from "./Game";
 import { GameMap, type TileRef } from "./GameMap";
-import { UnitType } from "core-public/game/GameTypes";
+import { UnitType } from "engine-public/game/GameTypes";
 
 /** Player members read by Config gold/troop calculations. */
 export type PlayerLike = Pick<

packages/engine/src/game/Stats.ts

@@ -1,5 +1,5 @@
-import { AllPlayersStats } from "core-public/Schemas";
-import { NukeType, OtherUnitType, PlayerStats } from "core-public/StatsSchemas";
+import { AllPlayersStats } from "engine-public/Schemas";
+import { NukeType, OtherUnitType, PlayerStats } from "engine-public/StatsSchemas";
 import { Player, TerraNullius } from "./Game";
 
 export interface Stats {

packages/engine/src/game/StatsImpl.ts

@@ -1,4 +1,4 @@
-import { AllPlayersStats } from "core-public/Schemas";
+import { AllPlayersStats } from "engine-public/Schemas";
 import {
   ATTACK_INDEX_CANCEL,
   ATTACK_INDEX_RECV,
@@ -30,7 +30,7 @@ import {
   PlayerStats,
   unitTypeToBombUnit,
   unitTypeToOtherUnit,
-} from "core-public/StatsSchemas";
+} from "engine-public/StatsSchemas";
 import { Player, PlayerType, TerraNullius, UnitType } from "./Game";
 import { Stats } from "./Stats";
 

packages/engine/src/game/TeamAssignment.ts

@@ -1,5 +1,5 @@
 import { PseudoRandom } from "../PseudoRandom";
-import { ClientID } from "core-public/Schemas";
+import { ClientID } from "engine-public/Schemas";
 import { simpleHash } from "../Util";
 import { PlayerInfo, PlayerType, Team } from "./Game";
 

packages/engine/src/game/TerraNulliusImpl.ts

@@ -1,4 +1,4 @@
-import { ClientID } from "core-public/Schemas";
+import { ClientID } from "engine-public/Schemas";
 import { TerraNullius } from "./Game";
 
 export class TerraNulliusImpl implements TerraNullius {

packages/engine/src/game/UserSettings.ts

@@ -1,9 +1,9 @@
 import {
   GraphicsOverrides,
   GraphicsOverridesSchema,
-} from "core-public/GraphicsOverrides";
-import { Cosmetics } from "core-public/CosmeticSchemas";
-import { PlayerPattern } from "core-public/Schemas";
+} from "engine-public/GraphicsOverrides";
+import { Cosmetics } from "engine-public/CosmeticSchemas";
+import { PlayerPattern } from "engine-public/Schemas";
 
 export function getDefaultKeybinds(isMac: boolean): Record<string, string> {
   return {

packages/engine/src/validations/username.ts

@@ -1,4 +1,4 @@
-import { ClanTagSchema, UsernameSchema } from "core-public/Schemas";
+import { ClanTagSchema, UsernameSchema } from "engine-public/Schemas";
 
 export const MIN_USERNAME_LENGTH = 3;
 export const MAX_USERNAME_LENGTH = 27;

packages/engine/src/worker/WorkerClient.ts

@@ -10,7 +10,7 @@ import {
 } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 import { ErrorUpdate, GameUpdateViewData } from "../game/GameUpdates";
-import { ClientID, GameStartInfo, Turn } from "core-public/Schemas";
+import { ClientID, GameStartInfo, Turn } from "engine-public/Schemas";
 import { generateID } from "../Util";
 import { WorkerMessage } from "./WorkerMessages";
 // Inlined into the main bundle as a same-origin Blob, sidestepping the

packages/engine/src/worker/WorkerMessages.ts

@@ -8,7 +8,7 @@ import {
 } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 import { ErrorUpdate, GameUpdateViewData } from "../game/GameUpdates";
-import { ClientID, GameStartInfo, Turn } from "core-public/Schemas";
+import { ClientID, GameStartInfo, Turn } from "engine-public/Schemas";
 
 export type WorkerMessageType =
   | "init"