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.

1 files changed, 5 insertions, 2 deletions

diff --git a/modules/core/core-bundle.js b/modules/core/core-bundle.js
index 0b2795a..c8a4c2e 100644
--- a/modules/core/core-bundle.js
+++ b/modules/core/core-bundle.js
@@ -17912,8 +17912,11 @@ class MemoryGraphModule {
                 var useCount = stats.useCount || 0;
                 var lastUsed = stats.lastUsed ? new Date(stats.lastUsed).getTime() : 0;
                 if (useCount === 0 && (now - lastUsed > staleThreshold || lastUsed === 0)) {
-                    var daysUnused = lastUsed > 0 ? Math.floor((now - lastUsed) / 86400000) : 999;
-                    stale.push({ name: name, daysUnused: daysUnused });
+                    // v4.6.85: never fabricate a measurement. A skill with useCount 0 and no
+                    // lastUsed has NEVER been used — reporting it as "999d unused" invented a
+                    // number that then appeared in the audit as if it had been observed.
+                    var daysUnused = lastUsed > 0 ? Math.floor((now - lastUsed) / 86400000) : null;
+                    stale.push({ name: name, daysUnused: daysUnused, neverUsed: lastUsed === 0 });
                 }
             }
             this._untrackedSkills = untracked;