test(cache): close resolver generated cache reuse phase

[snkmcb]

Summary

• verify stable resolver generated-cache hits
• verify incomplete and corrupted resolver cache recovery
• verify validation-token changes miss the old entry for the same identifier
• document ownership separation between generated-USDC and source byte-range caching
• link the authoring cache adapter into the COPC integration test target

Validation

• ost plugin test .\plugins\pointcloud-copc --up-to 4 passes
• pointcloudCopc_tests compiles and links
• git diff --check passes
• direct CTest execution remains blocked by the local runtime DLL composition (