Support self and parent types for Container

[clue]

This changeset adds support for self and parent types for Container factory functions and constructors. Previously, these types were treated as literal class names, so autowiring would throw an Error (Class self not found) and a matching container variable would be rejected with a TypeError. They now resolve against the class the parameter is declared in, including as part of union types (PHP 8+):

class AdminController extends UserController
{
    public function __construct(parent $user)
    {
        // …
    }
}

This includes new test cases covering self and parent types for autowiring and container variables. This has 100% code coverage and should be safe to apply.

Builds on top of #307, #306, #303, #287, #286, #284, #182 and others

[Copilot]

Copilot review overview

🟢 Approval recommended

The remaining feedback is a minor, non-blocking test-coverage suggestion.

Review effort: Lite
Findings: None

What changed in this PR

Adds support for resolving self and parent types in Container parameters, including union types.

Changes:

• Resolves relative types against the declaring class.
• Supports autowiring and configured container values.
• Adds factory and union-type test coverage.

File	Summary
tests/​ContainerTest.php	Adds coverage for relative and union type scenarios.
src/​Container.php	Implements scoped self/parent type resolution.

Review note: One minor, non-blocking suggestion remains to add constructor-specific coverage.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.