v0.4.1

Highlights

A pure quality pass — no behavioural changes. Every module now lints
clean under cargo clippy --all-targets --all-features -- -D warnings,
formats clean under cargo fmt --all -- --check, and the 47-test
suite passes on native + wasm.

What's in this release

• style: rustfmt-sweep across all 33 modules, 672 lines rewrapped
• style: drop redundant as i64 casts in time.rs
• style: collapse nested-if in web/mod.rs rate-limit gate
• style: remove unused drop(tls) and use super::* in tests
• style: use range-contains instead of open comparisons in time.rs

Verification

cargo test --lib           → 47 passed, 0 failed
cargo clippy ... -D warnings → clean
cargo fmt --all -- --check  → clean
wasm-pack build --release    → 44801-byte SVG output