fix(test): resolve vitest path in integration and e2e scripts

The integration and e2e scripts were using 'vitest' as a bare command,
which fails in CI environments where node_modules/.bin is not in PATH.
This caused "Unknown command: vitest" errors.

Resolved by adding vitest path resolution matching the dotenvx pattern:
- Resolve full path to vitest binary in node_modules/.bin
- Handle Windows .cmd extension for cross-platform compatibility
- Pass resolved path to dotenvx wrapper

This completes the fix started in 240a09e and ensures both dotenvx
and vitest commands work in CI environments.

Author: jdalton

packages/cli/scripts/e2e.mjs

@@ -98,6 +98,10 @@ async function runVitest(binaryType) {
   const dotenvxCmd = WIN32 ? 'dotenvx.cmd' : 'dotenvx'
   const dotenvxPath = path.join(NODE_MODULES_BIN_PATH, dotenvxCmd)
 
+  // Resolve vitest path.
+  const vitestCmd = WIN32 ? 'vitest.cmd' : 'vitest'
+  const vitestPath = path.join(NODE_MODULES_BIN_PATH, vitestCmd)
+
   const result = await spawn(
     dotenvxPath,
     [
@@ -106,7 +110,7 @@ async function runVitest(binaryType) {
       '-f',
       '.env.e2e',
       '--',
-      'vitest',
+      vitestPath,
       'run',
       'test/e2e/binary-test-suite.e2e.test.mts',
       '--config',

packages/cli/scripts/integration.mjs

@@ -101,6 +101,10 @@ async function runVitest(binaryType) {
   const dotenvxCmd = WIN32 ? 'dotenvx.cmd' : 'dotenvx'
   const dotenvxPath = path.join(NODE_MODULES_BIN_PATH, dotenvxCmd)
 
+  // Resolve vitest path.
+  const vitestCmd = WIN32 ? 'vitest.cmd' : 'vitest'
+  const vitestPath = path.join(NODE_MODULES_BIN_PATH, vitestCmd)
+
   const result = await spawn(
     dotenvxPath,
     [
@@ -109,7 +113,7 @@ async function runVitest(binaryType) {
       '-f',
       '.env.test',
       '--',
-      'vitest',
+      vitestPath,
       'run',
       'test/integration/binary/binary-test-suite.test.mts',
       '--config',