chore: AGENTS.md

AGENTS.md

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+# AGENTS.md - boardgame-core
+
+## Commands
+
+Prefer `bash.exe`(C:\Users\Administrator\AppData\Local\Microsoft\WindowsApps\bash.exe) over Powershell.
+
+```bash
+npm run build        # Build ESM bundle + declarations to dist/
+npm run test         # Run vitest in watch mode
+npm run test:run     # Run vitest once (no watch)
+npm run typecheck    # Type-check without emitting (tsc --noEmit)
+```
+
+### Running a single test file
+```bash
+npx vitest run tests/samples/tic-tac-toe.test.ts
+```
+
+### Running a single test by name
+```bash
+npx vitest run -t "should detect horizontal win for X"
+```
+
+## Code Style
+
+### Imports
+- Use **double quotes** for local imports, **single quotes** for npm packages
+- No path aliases — use relative `../` and `./` paths
+
+### Formatting
+- **4-space indentation**
+- **Semicolons** at statement ends
+- **Arrow functions** for callbacks; `function` keyword for methods needing `this` (e.g. command handlers)
+- No trailing whitespace
+
+### Naming Conventions
+- **Types/Interfaces**: `PascalCase` — `Part`, `Region`, `Command`, `IGameContext`
+- **Classes**: `PascalCase` — `Entity`, `AsyncQueue`, `Mulberry32RNG`
+- **Functions**: `camelCase`, verb-first — `createGameContext`, `parseCommand`, `isValidMove`
+- **Variables**: `camelCase`
+- **Constants**: `UPPER_SNAKE_CASE` — `BOARD_SIZE`, `WINNING_LINES`
+- **Test files**: `*.test.ts` mirroring `src/` structure under `tests/`
+
+### Types
+- **Strict TypeScript** is enabled — no `any`
+- Use **generics** heavily: `Entity<T>`, `CommandRunner<TContext, TResult>`
+- Use **type aliases** for object shapes (not interfaces)
+- Use **discriminated unions** for results: `{ success: true; result: T } | { success: false; error: string }`
+- Use `unknown` for untyped values, narrow with type guards or `as`
+
+### Error Handling
+- Prefer **result objects** over throwing: return `{ success, result/error }`
+- When catching: `const error = e as Error;` then use `error.message`
+- Use `throw new Error(...)` only for truly exceptional cases
+- Validation error messages are in Chinese (e.g. `"参数不足"`)
+
+### Testing
+- **Vitest** with globals enabled (`describe`, `it`, `expect` available without import)
+- Use `async/await` for async tests
+- Narrow result types with `if (result.success)` before accessing `result.result`
+- Define inline helper functions in test files when needed
+- No mocking — use real implementations
+- Test helpers: `createTestContext()`, `createTestRegion()`
+
+## Architecture Notes
+
+- **Reactivity**: `Entity<T>` extends Preact Signal — access state via `.value`, mutate via `.produce(draft => ...)`
+- **Command system**: CLI-style parsing with schema validation via `inline-schema`
+- **Prompt system**: Commands prompt for input via `PromptEvent` with `resolve`/`reject`
+- **Barrel exports**: `src/index.ts` is the single public API surface