docs(task): archive options Phase 1 hardening

[blakinio]

Purpose

Close the task lifecycle after merged PR #93.

Evidence

• feature head cce607fe4b7555879347dd7ba6cc8a0abded71cb;
• exact-head CI run 30496430978;
• one inspected infrastructure-only vcpkg download failure followed by a successful failed-job retry;
• retry CMake Tests job 90813266723 passed Run CMake and Run CTest;
• all Windows variants and CI / Required passed;
• squash merge bdb73eea3c862f31e87fca81317ab3511c3a85a0.

Scope

Move the completed task record from active to archive. No runtime, test, workflow or changelog behavior changes.