#8 Split slow Windows test loops into per-case tests

Test-only. CL-52 becomes seven per-hint tests and the shipped-origin test becomes one test per provider and host, so a slow GitHub Windows runner can't push one long loop past Bun's 5 s limit. Assertions, the CL ledger and timeouts are unchanged. On the Windows build machine each new test runs in 190-360 ms.

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Summary by cubic

Splits the slow Windows test loops into per-case tests so a single GitHub Windows runner can't push past Bun's 5 s limit.

• CL-52 becomes seven per-hint tests.
• The shipped-origin test becomes one test per provider and host.
• Assertions, the CL ledger, and timeouts are unchanged; each new test runs 190-360 ms on Windows.