[BUG] `--if-present` flag behavior doesn't match docs

[binyamin]

✅ Expected Behavior

The docs sound like this flag works even if none of the workspace's packages list the script.

Don’t fail if the script doesn’t exist. Useful when running scripts across workspaces where not all packages have the same scripts.

• https://docs.vlt.sh/cli/commands/run#--if-present

FWIW, NPM doesn't have a problem here.

❌ Actual Behavior

It errors as if the flag was not passed.

🔄 Steps to Reproduce

1. Go to the test case

   vltpkg/src/cli-sdk/test/commands/run.ts

   Line 170 in 9f94bf4

   t.test('run script across workspaces with some missing', async t => {

2. In the argument list, change "hello" to "goodbye"
   

   vltpkg/src/cli-sdk/test/commands/run.ts

   Lines 201 to 205 in 9f94bf4

   	const conf = await Config.load(t.testdirName, [
   	'hello',
   	...args,
   	'--view=human',
   	])

3. Run tests, and watch them fail

🌍 Environment

• OS: linux v24.14.0
• Node: v24.14.0
• vlt: 1.0.0-rc.24

🔄 Frequency

Always - Happens every time