052 pattern branches

// ============================================================================
// TEST: Pattern Branches Parser Support
// ============================================================================
// Verifies that the parser correctly handles [...] pattern branch syntax.
// Pattern branches allow opaque expressions as branch names for DSL transforms.
//
// The [...] content is passed through as the branch name - transforms interpret it.
// ============================================================================

// Simple event to test pattern branches
~event test-patterns {}

~proc test-patterns|zig {
}

// Test that pattern branches parse correctly
// The branch names are [GET /users/:id] etc - opaque to the compiler
~test-patterns()
| [GET /users/:id] => ok {}
| [POST /users] => ok {}
| [nested [brackets] work] => ok {}
| [* -> stopped] => ok {}  // State machine style

// Verify nested patterns work
~test-patterns()
| [/admin/*] |> test-patterns()
    | [GET /dashboard] => ok {}