Brummel
8685e96970
- docs/WhatsNew.md: append a user-facing entry describing the new local-mutable-state block — what it does, what it does not yet cover (heap-Str and user ADTs), the two example fixtures, and the broader streaming-workloads motivation. No internals. - docs/roadmap.md: the Stateful-islands milestone flips from [ ] to [~] (in progress). A Progress paragraph records sub-milestone 1 (mut-local) as closed with its commit references, and enumerates the remaining sub-milestones (effect-handler infrastructure, refs + !Mut, MutArray, Stateful + pipe) — each to be brainstormed separately so each one stays small and audit-friendly.