Brummel
f355899fdf
One iteration (not the 4-then-3 split the brainstorm carrier assumed): the recon's cross-references prove a Rust exhaustive-match enum-variant removal is atomic and the workspace test suite is necessarily red between the Rust cut and the fixture/doc/drift cleanup, so the full cargo-test green gate can only sit at the final task. 6 tasks: T1 RED must-fail pins, T2 the atomic Rust cut (~40 match arms + mut_scope_stack signature + all ~37 callers + escape-guard loop-half-preserving simplification + codegen rename mut_var_allocas→binder_allocas; gate cargo build 0-errors + T1 GREEN), T3 dangling test-pin deletions, T4 DESIGN.md hard-delete, T5 faithful let/if fixture rewrites + 3 rejection-probe deletions, T6 carve_out 18→12 + roadmap + final full-suite + loop/recur non-regression gate. Plan-recon resolved 3 open Qs (form_a.md does not exist — grammar lives in parse.rs doc-comment; round_trip.rs + roundtrip_cli.rs auto-sweep examples/; escape.rs:533 walker is loop-reachable).