docs: 80% Kover coverage floor is claimed in five places but the real per-module floors are 99% / 99% / 90%

[OmarAlJarrah]

Problem

Several places assert an 80% line-coverage floor:

• .github/workflows/ci.yml:86 — comment: "koverVerify … enforces the 80% line-coverage rule"
• README.md:16 — coverage badge
• README.md:167 — prose: "an 80% Kover line-coverage floor"
• site/src/content/docs/guides/building-from-source.mdx:21 — repeats the 80% figure

None of the three modules actually enforces an 80% line floor:

• kuri/build.gradle.kts:232 — minBound(99, LINE)
• kuri-bind/build.gradle.kts:94 — minBound(99, LINE)
• kuri-serde-kotlinx/build.gradle.kts:86 — minBound(90, LINE)

The only "80" anywhere in the coverage configuration is a branch floor on kuri-serde-kotlinx, not a line floor on any module. The comment right next to the real rule in kuri/build.gradle.kts documents the 99% line floor, directly contradicting the CI comment and the public docs a few files away. The docs also don't mention the additional 85% branch floor kuri carries.

Impact

A contributor reads the 80% figure, adds code that's reachable at roughly 85% coverage expecting ./gradlew build to pass, and the actual 99% floor fails the build. The public README badge simultaneously understates the real coverage guarantee to anyone evaluating the library.

Suggested fix

Update all four locations to state the real per-module floors (99% line / 85% branch for kuri and kuri-bind, 90% line for kuri-serde-kotlinx), or generate the badge/doc text from the Gradle config so it can't drift again.