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`pmg setup doctor` reported npm protection as OK on a machine with no npm installed. Two compounding defects: 1. The availability gate used a plain `exec.LookPath`, which resolves the PMG shim on PATH rather than the real binary, so the "skip" branch never fired. It now uses `shim.ResolveRealBinary` (PATH with shim dirs stripped), matching the runner, so a missing real binary correctly yields WARN "not available". 2. The result was inferred purely from a non-zero exit, so PackageManagerNotFound (exit 127) and other failures were misread as a successful block. The check now requires PMG's block headline in the captured output before reporting PASS; other non-zero exits report WARN with the error surfaced. The block headline is extracted into `ui.MalwareBlockedHeadline` so the doctor's marker stays in sync with what PMG prints across its block-output sites.