Add macOS Intel (x64) Support for Valdi Hotreload

[japheth-waswa]

Summary

This PR adds full hotreload support for macOS Intel (x86_64) machines by enabling the Valdi compiler companion to load to load a native SQLite binding for intel platforms

🧠 Motivation

Valdi hotreload previously failed on macOS Intel systems with:

Unsupported platform and arch combination (darwin on arch x64)

This was caused by:

• Missing native SQLite binding for macOS x86_64
• Platform detection logic supporting only arm64 and Linux x64

This PR enables Intel developers to use Valdi without requiring ARM hardware.

🆕 Changes

• Added platform support for "darwin" && "x64" in the file compiler/companion/src/cache/SQLiteCompilationCache.ts

else if (platform === 'darwin' && arch === 'x64') {
    nativeBinding = require('../sqlite_bindings/better_sqlite3_macos_x64.node');
  }

• Added better_sqlite3_macos_x64.node native binding
  Compiled specifically for macOS Intel using Node v22.21.1 to match Valdi's embedded Node runtime.

🔧 Build Environment Used for this PR

• Node.js Version: v22.21.1
• Node ABI Version: 127
• Architecture: x86_64
• OS: macOS 15.1 (Sequoia) Intel

🔧 Build Procedure

nvm install 22.21.1
nvm use 22.21.1
git clone https://github.com/WiseLibs/better-sqlite3
cd better-sqlite3
npm install
npm run build-release

Produced file

build/Release/better_sqlite3.node
 → renamed to better_sqlite3_macos_x64.node
 → placed inside compiler/companion/src/sqlite_bindings/

🧪 Testing

✔ valdi hotreload works on macOS Intel
✔ Builds correctly using Bazel
✔ Local projects bootstrap and sync as expected
✔ SQLiteCompilationCache initializes successfully

📌 Compatibility

This change is:

• fully backward-compatible
• safe for macOS ARM
• safe for Linux
• no impact on iOS/Android build pipelines
• introduces no behavioral changes outside Intel runtime

🙌 Notes

If Valdi upgrades its embedded Node version in the future, maintainers need to rebuild both:

• better_sqlite3_macos_x64.node
• better_sqlite3_macos_arm64.node

using the same embedded Node version & ABI.