003 mismatch must error

✓ Passing This code compiles and runs correctly.

Code

// TEST: Auto-proc synthesis must fail when shapes don't match
//
// MUST_FAIL: Missing proc
//
// When input/output don't match, the compiler cannot synthesize a proc.
// This event has different field names - no auto-synthesis possible.

~import "$std/io"

// Input has 'input_val', output has 'output_val' - MISMATCH
~pub event mismatched { input_val: i32 }
| done { output_val: i32 }

// This should fail - no proc and can't synthesize
~mismatched(input_val: 42)
| done d |> std.io:print.ln("should not reach here")
input.kz

Error Verification

Expected Error Pattern

Missing proc implementation

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 (26 items)
[PHASE 2.6] Rescanning transformed AST (26 items)
[PHASE 2.6] Rescan complete: 27 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.io:print.ln
  [6] std.io:print.blk
  [7] std.testing:test
  [8] std.testing:validate_mocks
  [9] std.testing:test.with_harness
  [10] std.testing:test.harness
  [11] std.testing:assert
  [12] std.testing:test.property.equivalent
  [13] std.deps:deps
  [14] std.deps:requires.system
  [15] std.deps:requires.zig
  [16] std.control:if
  [17] std.control:for
  [18] std.control:capture
  [19] std.control:const
  [20] std.build:requires
  [21] std.build:variants
  [22] std.build:config
  [23] std.build:command.sh
  [24] std.build:command.zig
  [25] std.build:step
  [26] std.template:define
error[KORU100]: unused binding 'd'
  --> flow_check:17:0

❌ Compiler coordination error: Flow validation failed
error: CompilerCoordinationFailed
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/350_AUTO_PROC/350_003_mismatch_must_error/backend.zig:10859:17: 0x100bce433 in emit (backend)
                return error.CompilerCoordinationFailed;
                ^
/Users/larsde/src/koru/tests/regression/300_ADVANCED_FEATURES/350_AUTO_PROC/350_003_mismatch_must_error/backend.zig:10943:28: 0x100bcf1bf in main (backend)
    const generated_code = try RuntimeEmitter.emit(compile_allocator, final_ast);
                           ^

Test Configuration

MUST_FAIL
← 002 phantom transition 004 uncalled event ok →