fix(multi): accept --projects as an array

[pjcdawkins]

Summary

platform multi -p id1,id2 -- <cmd> failed with:

In ArrayArgument.php line 42:
  [BadMethodCallException]
  The value of option --projects is not an array

MultiCommand declared --projects with InputOption::VALUE_REQUIRED only, so Symfony returned the option value as a string. getSelectedProjects() then read it through ArrayArgument::getOption(), which insists on an array and threw before any project lookup happened.

Add InputOption::VALUE_IS_ARRAY to the option definition, matching every other command that consumes its option through ArrayArgument::getOption (Environment\List, Resources, User\Add, etc.). ArrayArgument::split() still handles comma- and whitespace-separated values, so -p a,b,c, -p a -p b, and -p "a b" all work.

Add an integration test that runs multi against two mocked projects using both comma-separated and repeated -p forms, and asserts the unknown-ID path produces the "Project ID(s) not found" error.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Fixes a bug in platform multi -p id1,id2 -- <cmd> which threw a BadMethodCallException because the --projects option was declared as a single string but read as an array via ArrayArgument::getOption. Adding VALUE_IS_ARRAY aligns the option with every other command that uses ArrayArgument, and the new integration test covers comma-separated, repeated -p, and unknown-ID flows.

Changes:

• Add InputOption::VALUE_IS_ARRAY to the --projects option in MultiCommand.
• Add an integration test exercising both comma-separated and repeated -p invocations plus the "Project ID(s) not found" error path.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
legacy/src/Command/MultiCommand.php	Declares --projects as a VALUE_IS_ARRAY option so ArrayArgument::getOption no longer throws.
integration-tests/multi_test.go	New test covering successful multi runs with two project IDs (comma + repeated forms) and the unknown-ID error path.

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