Persist pre-trace ExecutionResult to embed exec_result_ref in traces
Capture node-level runtime diagnostics and clone into trace artifacts
Clarify trace spec for pre-trace result linkage
Add tests for exec_result_ref and node-failure diagnostics
Changes:
Added early bounds checks for nodes_len/roots_len against UINT32_MAX, plus safe guards for order allocation and roots_len * 8 overflow. pel_program_dag.c
New tests for oversized counts: test_pel_program_dag_encode.c
Wired the new test into CMake: CMakeLists.txt