Add resolveExprPropertyFetch to support Enum::CASE->value expressions

[devin-ai-integration]

Summary

Adds support for resolving property fetch expressions on objects in NodeExpressionResolver, enabling expressions like BackedEnum::CASE->value to be resolved correctly as parameter default values.

Changes

1. resolveExprPropertyFetch method in NodeExpressionResolver — resolves property access on objects (e.g. SomeEnum::CASE->value). Resets isConstant/constantName since PHP does not treat Enum::CASE->value as a constant.

2. fetchReflectionClass fix — uses native reflection for loaded enum classes so that getConstant() returns actual enum case instances (the parser-reflection ReflectionClass::getConstant() returns false for enum cases).

3. Test stub ClassWithBackedEnumDefaultValue in FileWithClasses81.php — uses BackedPhp81EnumHTTPMethods::GET->value as a parameter default.

4. Unit test in NodeExpressionResolverTest — verifies the resolver evaluates BackedPhp81EnumHTTPMethods::GET->value to 'get'.

5. Integration test in ReflectionParameterTest — verifies getDefaultValue() returns 'get' for the parameter with a backed enum property default.

Review & Testing Checklist for Human

• Verify the fetchReflectionClass change to use native reflection for enums doesn't affect other enum constant resolution paths (e.g. SomeEnum::CASE without property fetch)
• Run the full test suite (vendor/bin/phpunit) — all 12,738 tests pass with 0 failures
• Run PHPStan (vendor/bin/phpstan analyse src --no-progress) — 0 errors

Notes

The fetchReflectionClass change is necessary because the parser-reflection's ReflectionClass::getConstant() returns false for enum cases, while native PHP's \ReflectionClass::getConstant() correctly returns the enum instance. Using native reflection for loaded enums allows the property fetch chain to work correctly.

Link to Devin session: https://app.devin.ai/sessions/33bcb37b7b784272ad76aa48fe6683c4
Requested by: @lisachenko

[lisachenko]

resolves #155

[devin-ai-integration]

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