{
  "iter_id": "23.4",
  "date": "2026-05-11",
  "mode": "standard",
  "outcome": "DONE",
  "tasks_total": 11,
  "tasks_completed": 11,
  "reloops_per_task": {
    "1": 0,
    "2": 0,
    "3": 0,
    "4": 1,
    "5": 1,
    "6": 0,
    "7": 0,
    "8": 1,
    "9": 0,
    "10": 0,
    "11": 0
  },
  "review_loops_spec": 0,
  "review_loops_quality": 0,
  "blocked_reason": null,
  "bench_check_exit_code": 0,
  "bench_compile_check_exit_code": 0,
  "bench_cross_lang_exit_code": 0,
  "bench_regressed_metrics": 0,
  "bench_total_metrics": 112,
  "notes_per_task": {
    "4": "extended `synth` with new `&mut Vec<FreeFnCall>` channel instead of plan's separate-walker approach; bypassed plan Step 4.4 (`polymorphic_free_fns` env field unneeded under this approach); fixed builtin-discrimination bug (`==`-like operators in env.globals are filtered by `module_globals[<owner>].contains_key`)",
    "5": "added `substitute_rigids_in_term` to substitute rigid vars in the body — required because free-fn bodies (e.g. std_list.length) carry inner Lams with `param_tys: [Type::Var \"a\"]`; class-method arm doesn't need this because instance bodies are Lam-unwrapped at synth time",
    "8": "added Unit-default fallback for unpinned forall vars in `collect_mono_targets` + `collect_residuals_ordered` (mirrors pre-iter-23.4 codegen behaviour for sites like `is_empty(Nil)`); updated `ail emit-ir` command pipeline to include `lift_letrecs` + `monomorphise_workspace` (pre-iter-23.4 codegen-time poly path was masking this dependency)"
  }
}