Rule 8.1 forbids one multi-job workflow fronted by several cosmetically
labeled badges that all resolve to the same whole-workflow status. Split
ci.yml into one workflow per concern (gates, macOS, Linux, Windows,
WASM, corpus), each with a unique name, and point each README badge at
its own workflow through the native per-workflow badge. The WASM
workflow notes in a header that it is a build gate, not a test gate
(Rule 8.3). Add a static MIT license badge linking to LICENSE
(Rule 8.2). Step contents are unchanged from the previous jobs.