Brummel
44c6e56a0a
Milestone-close audit found three drift items (architect) plus two carry-on items; bench all-green. Fixes (rt.tidy, boss-direct): - 5th test parse_then_print_then_parse_is_idempotent_on_every_ailx_fixture enforces Direction 2 of the Roundtrip Invariant directly. The DESIGN.md enforcement list grows from four to five tests. - docs/roadmap.md P1 'Round-trip completeness invariant' entry retired with one-line journal mirror per roadmap convention. - DESIGN.md wording sync: <16-hex> → <16-lowercase-hex> for the Float-bits-hex spelling in the new section (matches §Data model). Milestone closed clean; five workspace-wide tests anchor the .ail.json ↔ .ailx bijection plus AST-variant coverage.