refactor: convert to npm-workspaces monorepo (engine/core-public/shared/client/server)

Restructure the single src/ tree into an npm-workspaces monorepo under
packages/, rename core -> engine, extract a types-only core-public layer,
and break the pre-existing engine -> client dependency cycle.

Structure (packages/):
  core-public  public API/wire schemas + shared enums (clean leaf)
  shared       framework-agnostic helpers (clean leaf)
  engine       deterministic simulation (was src/core)
  client       rendering/UI (was src/client)
  server       coordination (was src/server)

Dependency DAG: engine -> {core-public, shared}; client -> {core-public,
shared, engine}; server -> {core-public, engine}.

- npm workspaces: root package.json workspaces + per-package package.json;
  tsconfig.base.json holds shared options + path aliases
  (core-public/* shared/* engine/* client/* server/*) resolved uniformly by
  tsc, Vite (resolve.tsconfigPaths), Vitest, and tsx. Lockfile regenerated.
- core-public: moved Schemas/ApiSchemas/CosmeticSchemas/StatsSchemas/
  ClanApiSchemas/WorkerSchemas/Base64/PatternDecoder; extracted the enums
  (GameTypes), GameEvent type, emoji table, and GraphicsOverrides schema.
  Engine re-exports the moved enums/types so existing imports keep working.
- Broke engine -> client cycle:
  - renderNumber/renderTroops -> shared/format
  - NameBoxCalculator moved into engine
  - username validation returns translation key + params; client translates
  - applyStateUpdate moved to client (operates on the render-only PlayerState)
  - Config/UnitGrid/execution-Util/GameImpl now use structural read
    interfaces (engine/game/ReadViews: PlayerLike/UnitLike/GameLike) instead
    of importing client view classes; client imports view classes from a new
    client/view barrel; deleted the engine/game/GameView re-export shim.
- Build/deploy updated: vite.config, index.html, eslint, Dockerfile
  (copies packages/ + tsconfig.base.json before npm ci), .vscode, tests.

Verified: tsc --noEmit clean; 1364 + 65 tests pass; production vite build
succeeds; engine has zero client/server imports; core-public and shared are
dependency leaves.

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

tests/core/pathfinding/PathFinderStepper.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
-import { PathFinderStepper } from "../../../src/core/pathfinding/PathFinderStepper";
-import { PathFinder, PathStatus } from "../../../src/core/pathfinding/types";
+import { PathFinderStepper } from "engine/pathfinding/PathFinderStepper";
+import { PathFinder, PathStatus } from "engine/pathfinding/types";
 
 describe("PathFinderStepper", () => {
   function createMockFinder(

tests/core/pathfinding/PathFinding.Air.test.ts

@@ -1,8 +1,8 @@
 import { beforeAll, describe, expect, it } from "vitest";
-import { Game } from "../../../src/core/game/Game";
-import { TileRef } from "../../../src/core/game/GameMap";
-import { PathFinding } from "../../../src/core/pathfinding/PathFinder";
-import { SteppingPathFinder } from "../../../src/core/pathfinding/types";
+import { Game } from "engine/game/Game";
+import { TileRef } from "engine/game/GameMap";
+import { PathFinding } from "engine/pathfinding/PathFinder";
+import { SteppingPathFinder } from "engine/pathfinding/types";
 import { setup } from "../../util/Setup";
 
 describe("PathFinding.Air", () => {

tests/core/pathfinding/PathFinding.Rail.test.ts

@@ -1,8 +1,8 @@
 import { beforeAll, describe, expect, it } from "vitest";
-import { Game } from "../../../src/core/game/Game";
-import { TileRef } from "../../../src/core/game/GameMap";
-import { PathFinding } from "../../../src/core/pathfinding/PathFinder";
-import { SteppingPathFinder } from "../../../src/core/pathfinding/types";
+import { Game } from "engine/game/Game";
+import { TileRef } from "engine/game/GameMap";
+import { PathFinding } from "engine/pathfinding/PathFinder";
+import { SteppingPathFinder } from "engine/pathfinding/types";
 import { setup } from "../../util/Setup";
 
 describe("PathFinding.Rail", () => {

tests/core/pathfinding/PathFinding.Water.test.ts

@@ -1,11 +1,11 @@
 import { beforeAll, describe, expect, it, vi } from "vitest";
-import { Game } from "../../../src/core/game/Game";
-import { TileRef } from "../../../src/core/game/GameMap";
-import { PathFinding } from "../../../src/core/pathfinding/PathFinder";
+import { Game } from "engine/game/Game";
+import { TileRef } from "engine/game/GameMap";
+import { PathFinding } from "engine/pathfinding/PathFinder";
 import {
   PathStatus,
   SteppingPathFinder,
-} from "../../../src/core/pathfinding/types";
+} from "engine/pathfinding/types";
 import { setup } from "../../util/Setup";
 import { createGame, L, W } from "./_fixtures";
 

tests/core/pathfinding/SpatialQuery.test.ts

@@ -1,13 +1,13 @@
 import { describe, expect, it } from "vitest";
-import { SpawnExecution } from "../../../src/core/execution/SpawnExecution";
+import { SpawnExecution } from "engine/execution/SpawnExecution";
 import {
   Game,
   Player,
   PlayerInfo,
   PlayerType,
-} from "../../../src/core/game/Game";
-import { TileRef } from "../../../src/core/game/GameMap";
-import { SpatialQuery } from "../../../src/core/pathfinding/spatial/SpatialQuery";
+} from "engine/game/Game";
+import { TileRef } from "engine/game/GameMap";
+import { SpatialQuery } from "engine/pathfinding/spatial/SpatialQuery";
 import { createGame, L, W } from "./_fixtures";
 
 // Spawns player and **expands territory** via getSpawnTiles (euclidean dist 4)

tests/core/pathfinding/UniversalPathFinding.Parabola.test.ts

@@ -1,7 +1,7 @@
 import { describe, expect, it } from "vitest";
-import { GameMapImpl } from "../../../src/core/game/GameMap";
-import { UniversalPathFinding } from "../../../src/core/pathfinding/PathFinder";
-import { PathStatus } from "../../../src/core/pathfinding/types";
+import { GameMapImpl } from "engine/game/GameMap";
+import { UniversalPathFinding } from "engine/pathfinding/PathFinder";
+import { PathStatus } from "engine/pathfinding/types";
 
 describe("UniversalPathFinding.Parabola", () => {
   function createLargeMap() {

tests/core/pathfinding/WaterComponents.test.ts

@@ -2,7 +2,7 @@ import { describe, expect, it } from "vitest";
 import {
   ConnectedComponents,
   LAND_MARKER,
-} from "../../../src/core/pathfinding/algorithms/ConnectedComponents";
+} from "engine/pathfinding/algorithms/ConnectedComponents";
 import { createGameMap, createIslandMap, L, W } from "./_fixtures";
 
 // prettier-ignore

tests/core/pathfinding/_fixtures.ts

@@ -7,11 +7,11 @@ import {
   GameMapType,
   GameMode,
   GameType,
-} from "../../../src/core/game/Game";
-import { createGame as createGameImpl } from "../../../src/core/game/GameImpl";
-import { GameMapImpl } from "../../../src/core/game/GameMap";
-import { UserSettings } from "../../../src/core/game/UserSettings";
-import { GameConfig } from "../../../src/core/Schemas";
+} from "engine/game/Game";
+import { createGame as createGameImpl } from "engine/game/GameImpl";
+import { GameMapImpl } from "engine/game/GameMap";
+import { UserSettings } from "engine/game/UserSettings";
+import { GameConfig } from "core-public/Schemas";
 import { TestConfig } from "../../util/TestConfig";
 
 export const W = "W"; // Water

tests/core/pathfinding/transformers/ComponentCheckTransformer.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
-import { ComponentCheckTransformer } from "../../../../src/core/pathfinding/transformers/ComponentCheckTransformer";
-import { PathFinder } from "../../../../src/core/pathfinding/types";
+import { ComponentCheckTransformer } from "engine/pathfinding/transformers/ComponentCheckTransformer";
+import { PathFinder } from "engine/pathfinding/types";
 
 describe("ComponentCheckTransformer", () => {
   // Mock PathFinder that records calls and returns a simple path

tests/core/pathfinding/transformers/MiniMapTransformer.test.ts

@@ -1,7 +1,7 @@
 import { describe, expect, it } from "vitest";
-import { GameMapImpl } from "../../../../src/core/game/GameMap";
-import { MiniMapTransformer } from "../../../../src/core/pathfinding/transformers/MiniMapTransformer";
-import { PathFinder } from "../../../../src/core/pathfinding/types";
+import { GameMapImpl } from "engine/game/GameMap";
+import { MiniMapTransformer } from "engine/pathfinding/transformers/MiniMapTransformer";
+import { PathFinder } from "engine/pathfinding/types";
 
 describe("MiniMapTransformer", () => {
   // Create test maps: main map is 10x10, minimap is 5x5 (2x downscale)

tests/core/pathfinding/transformers/ShoreCoercingTransformer.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
-import { ShoreCoercingTransformer } from "../../../../src/core/pathfinding/transformers/ShoreCoercingTransformer";
-import { PathFinder } from "../../../../src/core/pathfinding/types";
+import { ShoreCoercingTransformer } from "engine/pathfinding/transformers/ShoreCoercingTransformer";
+import { PathFinder } from "engine/pathfinding/types";
 import { createGameMap, createIslandMap, L, W } from "../_fixtures";
 
 describe("ShoreCoercingTransformer", () => {