fix(newos4): the audit stops inventing '999d unused' (v4.6.85)

getStaleSkills() returned daysUnused=999 for a skill that had useCount 0 and no lastUsed — a
placeholder rendered by the audit as '999d unused', indistinguishable from a measurement. It told
the operator to archive procedural memory that had simply never been instrumented.

Now: daysUnused null + neverUsed true when there is no lastUsed; real day count otherwise; the
audit prints '(never used)'.

Verified: probe skill with no telemetry -> {daysUnused: null, neverUsed: true}; one last used
2026-08-01 -> 83; no 999 anywhere in getStaleSkills() or the audit output.

0 files changed, 0 insertions, 0 deletions