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.

3 files changed, 11 insertions, 5 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;
diff --git a/modules/core/module-loader.js b/modules/core/module-loader.js
index 9a373a6..1b0f6d9 100644
--- a/modules/core/module-loader.js
+++ b/modules/core/module-loader.js
@@ -4,7 +4,7 @@
     // Core module bundle loaded synchronously in main.html.
     // This loader only handles version cache-busting, splash, terminal init, and optional ext modules.
 
-    const LATEST_VER = 'v4.6.84';
+    const LATEST_VER = 'v4.6.85';
     const CACHE = '?v=' + LATEST_VER;
     const stored = localStorage.getItem('webx11_cache_ver');
     if (stored !== LATEST_VER) {
diff --git a/modules/core/module-memory-graph.js b/modules/core/module-memory-graph.js
index 093d2e4..1cb0919 100644
--- a/modules/core/module-memory-graph.js
+++ b/modules/core/module-memory-graph.js
@@ -482,8 +482,11 @@ 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;