Review round 1 on PR #176: reverting the BackfillRefs concept-page read to os.ReadFile left every test green. The static symlinked page never reaches that read, because LoadInventory does not list it; the read is reachable only when a page listed as regular is swapped for a symlink before it is read. New test does that against an in-brain target and reads the page back with O_NOFOLLOW; red under the flip (2/2), green 3/3 on head. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>