001 slice type imported module

✓ Passing This code compiles and runs correctly.

Code

// ============================================================================
// BUG 990: Slice Types from Imported Modules Generate Invalid Zig
// ============================================================================
//
// Issue: When a Koru event returns a slice of a type from an imported module,
// the generated Zig code has incorrect syntax.
//
// Expected Zig:  handles: []const koru_mylib.Handle
// Actual Zig:    handles: koru_[]const mylib.Handle    ❌ INVALID!
//
// This affects any event that returns/accepts slices of imported types.
//
// Discovered while building $std/threading library (test 2006)
// ============================================================================

const std = @import("std");
~import $std/threading

// Minimal reproduction: Event that returns slice of imported type
~event getHandles {}
| got { handles: []const threading:WorkerHandle }

~proc getHandles {
    // Create empty slice just to test codegen
    const handles = std.heap.page_allocator.alloc(threading:WorkerHandle, 0) catch unreachable;
    return .{ .got = .{ .handles = handles } };
}

// Try to use it
~getHandles()
| got |> _
input.kz

Error Verification

Actual Compiler Output 

[PHASE 2.4] Calling run_pass for transforms\n[PHASE 2.5] Executing comptime_main() - running comptime flows
[PHASE 2.5] Comptime flows complete (36 items)
[PHASE 2.6] Rescanning transformed AST (36 items)
[PHASE 2.6] Rescan complete: 25 comptime events found
  [0] std.compiler:requires
  [1] std.compiler:flag.declare
  [2] std.compiler:command.declare
  [3] std.compiler:coordinate
  [4] std.compiler:context_create
  [5] std.testing:test
  [6] std.testing:validate_mocks
  [7] std.testing:test.with_harness
  [8] std.testing:test.harness
  [9] std.testing:assert
  [10] std.testing:test.property.equivalent
  [11] std.deps:deps
  [12] std.deps:requires.system
  [13] std.deps:requires.zig
  [14] std.control:if
  [15] std.control:for
  [16] std.control:capture
  [17] std.control:const
  [18] std.build:requires
  [19] std.build:variants
  [20] std.build:config
  [21] std.build:command.sh
  [22] std.build:command.zig
  [23] std.build:step
  [24] std.template:define
error[KORU030]: branch 'got' has payload but no binding
  --> structural_check:31:0

❌ Compiler coordination error: Incomplete branch coverage
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/500_INTEGRATION_TESTING/520_BUG_REPRODUCTION/520_001_slice_type_imported_module/backend.zig:9614:17: 0x104ff6433 in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/500_INTEGRATION_TESTING/520_BUG_REPRODUCTION/520_001_slice_type_imported_module/backend.zig:9698:28: 0x104ff71bf in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Test Configuration

MUST_FAIL
← undefined event 002 array literal imported type →