1. [correctness] [apps/rust/static/app.js:10](/home/paulca/amadan.net/carlos/todomvc-bakeoff/.worktrees/rust/apps/rust/static/app.js:10): Filter navigation can discard pending changes. Requests wait in a promise queue, but filter links navigate immediately. With a toggle request pending, edit another todo and click a filter: blur queues the save, then navigation destroys the queue before that save reaches the server. Wait for pending actions before navigating.
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2. [spec] [apps/rust/src/main.rs:45](/home/paulca/amadan.net/carlos/todomvc-bakeoff/.worktrees/rust/apps/rust/src/main.rs:45): `--listen` accepts every loopback address, including `::1` and `127.0.0.2`. The brief explicitly restricts binding to `127.0.0.1`. Validate that exact address.
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