reads token usage already on the machine and serves a rust/wasm dashboard. data stays local — nothing is uploaded. there is no public demo because the interesting part is your own usage.
rustup target add wasm32-unknown-unknown (cd crates/usage-ui && trunk build --release) USAGE_PORT=8080 cargo run -p usage-server
open http://localhost:8080. needs rust nightly (see rust-toolchain.toml) and trunk. default listen port is 443 if USAGE_PORT is unset.