Modernize project tooling, CI, and example apps

[usama-liaqat]

Summary

The project's tooling, CI pipelines, and example apps were outdated — Yarn Classic (v1), Node 10 Docker images, JDK 11, Ruby 2.7, deprecated GitHub Actions (v2), and a single example/ directory tied to an older React Native version. This PR
modernizes everything to align with the current ecosystem and replaces the monolithic example/ and exampleExpo/ directories with a clean examples/bare/ and examples/expo/ workspace structure.

Changelog

[General] [Changed] - Migrated from Yarn Classic to Yarn Berry 4.14.1 with workspaces consolidated to examples/*

[General] [Changed] - Replaced example/ and exampleExpo/ with examples/bare/ (React Native 0.85.2) and examples/expo/ (React Native 0.81.5 via Expo SDK)

[General] [Changed] - Modernized tsconfig.json (jsx: react-jsx, moduleResolution: bundler, scoped include to src/)

[General] [Added] - Added src/global.d.ts to type AbortSignal.addEventListener/removeEventListener without requiring full DOM lib

[CI] [Changed] - Updated CircleCI Docker image from deprecated circleci/node:10 to cimg/node:22.11

[CI] [Changed] - Fixed CircleCI script references (typescript → typecheck, prepare → prepack)

[CI] [Changed] - Updated all GitHub Actions to latest versions (checkout@v4, setup-java@v4, cache@v4, stale@v9)

[CI] [Changed] - Updated JDK 11 → 17, Ruby 2.7 → 3.2, Xcode simulator iPhone 11 Pro → iPhone 15 Pro

[CI] [Changed] - Updated all path references from example/ to examples/bare/ and examples/expo/

[CI] [Changed] - Replaced yarn install --frozen-lockfile with yarn install --immutable across all workflows

[CI] [Changed] - Updated branch triggers from master to main

[CI] [Removed] - Removed manual yarn cache steps (Yarn Berry handles caching natively)

[CI] [Removed] - Removed deprecated .github/stale.yml (probot-stale), already replaced by stale-bot.yml workflow using actions/stale@v9

[Docs] [Changed] - Updated CONTRIBUTING.md with new paths, scripts (yarn example:bare, yarn example:expo), and removed obsolete new-arch toggle instructions

Test Plan

• yarn install completes successfully
• yarn typecheck passes with zero errors
• yarn lint passes
• yarn example:bare android builds and runs on device/emulator (React Native 0.85.2)
• yarn example:bare ios builds and runs on simulator (React Native 0.85.2)
• yarn example:expo start launches the Expo dev server (React Native 0.81.5)
• CI workflows should pass on this PR