plan: it.1 loop/recur additive — 8 tasks, stub-then-fill mirroring mut.1
Boss-resolved design decisions baked in (DD-1 loop_stack in synth like mut.2's mut_scope_stack + RecurNotInTailPosition in verify_tail_positions; DD-2 LoopBinder derives = MutVar's, no PartialEq; DD-3 stub-then-fill sequencing). Recon-enumerated walker-arm site list incl. the test-side exhaustive match (codegen_import_map_fallback_pin.rs:62) mut.1's plan missed. it.2/it.3 explicitly out of scope.
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