{
  "iter_id": "mir.4",
  "date": "2026-06-01",
  "mode": "standard",
  "outcome": "DONE",
  "tasks_total": 5,
  "tasks_completed": 5,
  "reloops_per_task": { "1": 0, "2": 0, "3": 0, "4": 0, "5": 0 },
  "review_loops_spec": 0,
  "review_loops_quality": 0,
  "blocked_reason": null,
  "notes": "The implement-orchestrator agent completed Tasks 1-2 (producer Heap-promotion of seed + recur-arg literals, codegen Heap leg, recur dec-gate !is_str deletion) clean and correctly BLOCKED on Task 3, surfacing a genuine spec defect: the plan/spec scoped the !is_str deletion to the recur dec gate ONLY (drop.rs:493 'stays conservative'), but #49's live=0 is unreachable that way — the agent showed Tasks 1-2 took #49 from live=3 to live=1, the residual being the loop-RESULT slab. Orchestrator verified the diagnosis empirically: (a) deleting drop.rs:493's !is_str took #49 and the recur-literal fixture to live=0; (b) print is a BORROWING consumer (`(let s (show x) (do io/print_str s))`), so the loop result is freed at the caller's scope-close (drop.rs:493), not by print — the scoping premise ('consumed by print') was wrong; (c) deleting drop.rs:493 WITHOUT exit-arm promotion SIGSEGVs (exit 139) on a loop returning a static Str literal — confirming a third promotion position is needed. Orchestrator corrected the spec refinement note (both gates; three promotion positions: seed + recur-arg + exit-arm tail) and completed the loop-result leg inline (context already fully loaded from the BLOCK diagnosis + empirical verification, per CLAUDE.md 'already loaded context' carve-out): added promote_tail_str_literals (tail walk over If/Let/LetRec/Match/Seq/ReuseAs), gated on a Str-returning loop; deleted drop.rs:493 !is_str; created examples/loop_str_static_exit_no_leak_pin.ail; lifted the #49 #[ignore]; added recur-literal + static-exit runtime pins + an exit-arm producer pin. Full workspace: 708 passed / 0 failed / 2 ignored (mir.3b baseline 702/0/3; +6 passed, -1 ignored = #49 lifted; the 2 remaining ignores are doctests). All four leak fixtures live=0 (#49 xyyy, recur-literal reset, static-exit result, ADT guard 2); ir_snapshot no drift; no lockstep pair touched. Durable lesson: 'consumed by print' != 'freed by print' — print borrows; a loop result's owner is the caller's binder. The single-gate scoping was the planning-time error the agent's empirical BLOCK caught."
}
