fix(managed-source): drop trailing period so @internal docblock is cs-fixer-stable

The round-2 @internal block in FactorySealedBy emitted '...on that basis.'
with a trailing period that PHP-CS-Fixer strips, so the generator output and
the cs-fixed output never agreed — every bin/qa run after the first failed the
managed-source drift check. Emit the line without the period (matching what
cs-fixer wants) so generate -> cs-fixer is idempotent.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: LTSCommerce

src/ManagedSource/ManagedSourceGenerator.php

@@ -178,7 +178,7 @@ private function renderFactorySealedBy(string $namespace): string
              *
              * @internal this managed artefact is not part of your package's public
              *           API surface, so a type:library consumer's API-surface
-             *           classification rule passes over it on that basis.
+             *           classification rule passes over it on that basis
              */
             #[Attribute(Attribute::TARGET_CLASS)]
             final readonly class FactorySealedBy