fix(build): pass environment to subprocess exec calls on Windows

Windows builds were failing with 'Could not locate Visual Studio installation'
even though VS environment variables (VCINSTALLDIR, WindowsSDKVersion, INCLUDE,
LIB) were successfully set via GITHUB_ENV and present in process.env.

Root cause: The exec() helper from @socketsecurity/lib doesn't automatically
inherit the parent process environment. Subprocesses (configure.py, ninja) were
running without the VS environment variables.

Fix: Explicitly pass 'env: process.env' to exec() calls for:
- configure.py (line 1432)
- ninja build (line 1505)

This ensures VS environment variables are inherited by Python and ninja
subprocesses, allowing them to locate Visual Studio.

Debug logging added in 972b591 removed as issue is now identified and fixed.

Author: jdalton

packages/node-smol-builder/scripts/build.mjs

@@ -1428,32 +1428,8 @@ async function main() {
   const configureCommand = WIN32 ? 'python' : './configure'
   const configureArgs = WIN32 ? ['configure.py', ...configureFlags] : configureFlags
 
-  // DEBUG: Check if VS environment variables are present (Windows only).
-  if (WIN32) {
-    logger.log('')
-    logger.log('Verifying MSVC environment variables in build script:')
-    const criticalVars = ['VCINSTALLDIR', 'WindowsSDKVersion', 'INCLUDE', 'LIB']
-    let allPresent = true
-    for (const varName of criticalVars) {
-      const value = process.env[varName]
-      if (value) {
-        logger.log(`  ${colors.green('✓')} ${varName} is set`)
-      } else {
-        logger.log(`  ${colors.red('✗')} ${varName} is NOT SET`)
-        allPresent = false
-      }
-    }
-    if (!allPresent) {
-      logger.error('VS environment variables are missing!')
-      logger.log('configure.py will fail with "Could not locate Visual Studio installation"')
-      logger.log('This means GITHUB_ENV did not properly pass variables to this process.')
-      throw new Error('Missing VS environment variables')
-    }
-    logger.log('')
-  }
-
   logger.log(`::group::Running ${WIN32 ? 'python configure.py' : './configure'}`)
-  await exec(configureCommand, configureArgs, { cwd: NODE_DIR })
+  await exec(configureCommand, configureArgs, { cwd: NODE_DIR, env: process.env })
   logger.log('::endgroup::')
   logger.log(`${colors.green('✓')} Configuration complete`)
   logger.log('')
@@ -1502,7 +1478,7 @@ async function main() {
     logger.log('::group::Compiling Node.js with Ninja (this will take a while...)')
 
     try {
-      await exec('ninja', ['-C', 'out/Release', `-j${CPU_COUNT}`], { cwd: NODE_DIR })
+      await exec('ninja', ['-C', 'out/Release', `-j${CPU_COUNT}`], { cwd: NODE_DIR, env: process.env })
       logger.log('::endgroup::')
     } catch (e) {
       logger.log('::endgroup::')