fix(factory): reject composite callable parameter types without Reflection method errors #50

Problem

CallableFactory checks for ReflectionType and then calls isBuiltin()/getName(). Those methods only exist on ReflectionNamedType, not ReflectionUnionType or ReflectionIntersectionType. A valid callable with a union/intersection parameter therefore triggers an engine Error instead of the factory's descriptive invalid-parameter exception.

Evidence / executed reproduction

Audited commit 67865fa35231c11e38c9facbfe775e0c5fbe2461.
CallableFactory.php:83–97.
On PHP 8.4.26, invoking:

$factory = new CallableFactory(fn(DateTime|DateTimeImmutable $value) => $value);
$factory($container);

produces Error: Call to undefined method ReflectionUnionType::isBuiltin() before any container lookup. No remote operation performed.

Expected / acceptance criteria

The existing documented scope is named class/interface arguments; this task does not request union/intersection autowiring support. Guard with ReflectionNamedType before using named-type methods and reject unsupported composite types through the existing RuntimeException::forInvalidParameterType path. Add union, intersection and DNF regression cases, as well as the existing scalar/untyped checks.

Priority P3; confidence high, dynamically reproduced with unmodified source. Direct callers currently cannot handle this using the documented factory error convention; ServiceProviderContainer may wrap the engine error, but the diagnostic remains incorrect.

Dedupe: reviewed all current and historical issues/PRs (#5–#49). This is independent of extension composition #48/#49 and native constructor autowiring #17/#18. No code, merge, release or deployment changes were made.