[Build from source] React Native 0.81.4 Cannot build from source when following the doc

Description

Following this doc to build from source for React Native. But cannot run yarn android. I think I missed something from the docs?
package.json:

{
  "name": "AwesomeProject",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "android": "react-native run-android",
    "ios": "react-native run-ios",
    "lint": "eslint .",
    "start": "react-native start",
    "test": "jest"
  },
  "dependencies": {
    "react": "19.1.0",
    "react-native": "facebook/react-native#0.81.4",
    "@react-native/new-app-screen": "0.81.4",
    "react-native-safe-area-context": "^5.5.2"
  },
  "devDependencies": {
    "@babel/core": "^7.25.2",
    "@babel/preset-env": "^7.25.3",
    "@babel/runtime": "^7.25.0",
    "@react-native-community/cli": "20.0.0",
    "@react-native-community/cli-platform-android": "20.0.0",
    "@react-native-community/cli-platform-ios": "20.0.0",
    "@react-native/babel-preset": "0.81.4",
    "@react-native/eslint-config": "0.81.4",
    "@react-native/metro-config": "0.81.4",
    "@react-native/typescript-config": "0.81.4",
    "@types/jest": "^29.5.13",
    "@types/react": "^19.1.0",
    "@types/react-test-renderer": "^19.1.0",
    "eslint": "^8.19.0",
    "jest": "^29.6.3",
    "prettier": "2.8.8",
    "react-test-renderer": "19.1.0",
    "typescript": "^5.8.3"
  },
  "engines": {
    "node": ">=20"
  }
}

settings.gradle

pluginManagement { includeBuild("../node_modules/@react-native/gradle-plugin") }
plugins { id("com.facebook.react.settings") }
extensions.configure(com.facebook.react.ReactSettingsExtension){ ex -> ex.autolinkLibrariesFromCommand() }
rootProject.name = 'AwesomeProject'
include ':app'
includeBuild('../node_modules/@react-native/gradle-plugin')
includeBuild('../node_modules/react-native') {
  dependencySubstitution {
    substitute(module("com.facebook.react:react-android")).using(project(":packages:react-native:ReactAndroid"))
    substitute(module("com.facebook.react:react-native")).using(project(":packages:react-native:ReactAndroid"))
    substitute(module("com.facebook.react:hermes-android")).using(project(":packages:react-native:ReactAndroid:hermes-engine"))
    substitute(module("com.facebook.react:hermes-engine")).using(project(":packages:react-native:ReactAndroid:hermes-engine"))
  }
}

Steps to reproduce

1. Start a fresh project
2. Following doc from https://reactnative.dev/contributing/how-to-build-from-source
3. run yarn android

React Native Version

0.81.4

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info

System:
  OS: macOS 26.1
  CPU: (10) arm64 Apple M4
  Memory: 538.31 MB / 24.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.12.0
    path: /Users/anh/.nvm/versions/node/v22.12.0/bin/node
  Yarn:
    version: 1.22.22
    path: /Users/abc/.nvm/versions/node/v22.12.0/bin/yarn
  npm:
    version: 10.9.0
    path: /Users/abc/.nvm/versions/node/v22.12.0/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.2
      - iOS 26.2
      - macOS 26.2
      - tvOS 26.2
      - visionOS 26.2
      - watchOS 26.2
  Android SDK:
    API Levels:
      - "33"
      - "35"
      - "36"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-36.1 | Google Play ARM 64 v8a
    Android NDK: 27.1.12297006
IDEs:
  Android Studio: 2025.2 AI-252.25557.131.2521.14432022
  Xcode:
    version: 26.2/17C52
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.17
    path: /usr/bin/javac
  Ruby:
    version: 3.4.7
    path: /opt/homebrew/opt/ruby/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  "@react-native/monorepo":
    installed: 1000.0.0
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native: Not Found
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

➜  AwesomeProject git:(main) yarn android                 
yarn run v1.22.22
$ react-native run-android
/bin/sh: react-native: command not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

MANDATORY Reproducer

https://github.com/kyunkakata/can-not-build-from-source-issue

Screenshots and Videos

No response

React Native のソースからのビルドに関するドキュメントと必須の再現手順から始め、その後、その package.json と settings.gradle を報告された yarn android の失敗と比較してください。react-native コマンドが利用できない理由を追跡し、提供された環境に対してドキュメントに記載されたセットアップを検証してください。ドキュメントに従った新しいプロジェクトがソースチェックアウトから yarn android を正常に実行できれば完了です。