Add stress example for autoload + reflection + case-insensitive class lookup

[nahime0]

Why

This combines multiple surfaces that already work individually but are riskier together:

• static autoload discovery
• class_exists() / literal class loading
• case-insensitive class lookup
• ReflectionClass construction from a differently-cased name
• attribute metadata lookup on the autoloaded class

This is a good candidate for catching resolver/name-resolution drift or reflection/autoload mismatches.

Proposed stress program

<?php
spl_autoload_register(function ($name) {
    if ($name === "Demo\\Thing") {
        require __DIR__ . "/DemoThing.php";
    }
});

if (class_exists("demo\\thing")) {
    $r = new ReflectionClass("DEMO\\THING");
    $attrs = $r->getAttributes();
    echo $r->getName() . "\n";
    echo count($attrs) . "\n";
    echo $attrs[0]->getName() . "\n";
}

What to verify

• Autoload is triggered consistently from the literal class probe.
• Canonical class identity survives case folding.
• Reflection sees the same declaration that autoload resolved.
• Attribute lookup matches the resolved class name and preserves PHP-visible behavior.

Scope

Track as stress coverage first; no confirmed bug yet.

[nahime0]

Fixed in b79ae02.

What changed:

• Added autoload interpreter metadata for the SPL autoload class-name parameter so direct class-name guards can resolve with PHP class-name case folding during AOT autoload discovery.
• Added regression coverage for class_exists("demo\thing") + ReflectionClass("DEMO\THING") + attribute lookup on the autoloaded class.
• Added examples/autoload-reflection-stress/ with the stress case from this issue.

Verification:

• cargo build
• cargo test test_autoload_reflection_case_insensitive_class_lookup_reads_attributes -- --nocapture
• cargo test test_reflection_class_get_name_for_autoloaded_class -- --nocapture
• cargo test test_class_exists_literal_triggers_autoload -- --nocapture
• cargo test test_register_with_str_replace_closure -- --nocapture
• cargo run -- examples/autoload-reflection-stress/main.php && ./examples/autoload-reflection-stress/main
• cargo test
• cargo test -- --include-ignored
• git diff --check
• git diff --cached --check

[nahime0]

Closed by b79ae02.