[danog]

The acceptance test configs suppressed Psalm 7's missing purity/immutability annotation issues instead of the fixtures declaring them.

Before:

<issueHandlers>
  <MissingPureAnnotation errorLevel="suppress" />
  <MissingAbstractPureAnnotation errorLevel="suppress" />
  <MissingImmutableAnnotation errorLevel="suppress" />
  <MissingInterfaceImmutableAnnotation errorLevel="suppress" />
</issueHandlers>

interface I { public function work(): int; }

After:

/** @psalm-mutable */
interface I {
  /** @psalm-impure */
  public function work(): int;
}

Needs vimeo/psalm#12421: without it Psalm rejects @psalm-pure on the generator providers.

https://claude.ai/code/session_01WNSb29tptiTQoc44Tk7XZW