[TS PBT] Collect per-property TypeScript coverage

[CaelmBleidd]

Summary

• add backend-neutral per-property coverage capability, request, artifact, and diagnostics
• collect isolated c8 10.1.3 Istanbul reports with source-map remapping and deterministic statement, function, and branch hits
• support coverage scopes plus include and exclude globs in the Kotlin API and CLI
• preserve predicate cwd while isolating c8 from project-local configuration
• package the collector in installDist and document the coverage contract

Verification

• ./gradlew --no-daemon :usvm-ts-pbt:check :usvm-ts-pbt:detektMain :usvm-ts-pbt:detektTest :usvm-ts-pbt:installDist
• installed-distribution smoke: no schemaVersion, c8 10.1.3, statement hits [1,1,1,1,1,1], function hits [1,1], branch hits [1,1,0], no diagnostics
• git diff --check

Closes #349