fix(newos4): stop reporting network and VFS size as facts we do not have (v4.6.161)

1. The last two `navigator.onLine`-as-fact payloads
   - module-aiassist.js: the debug/health payload carried
     `online: navigator.onLine`, consumed by downloads/dashboard.html, which rendered
     "🔴 Offline" — on an Android WebView (reports false while fully connected) that
     told working users they were offline. The key is gone; the payload carries
     `network:'unknown'`, `networkKnown:false` and `networkHint`.
   - module-world-model.js: the snapshot had the same field, and it is also handed to the
     LLM through `_modelDigest()`/`ask()`, so the model was told the user was offline.
     Now `network:'unknown'` + `networkKnown:false`.
   - `_loadFromVFS()` scrubs `system.online` from a model persisted by an older build —
     otherwise the stale boolean would survive inside the digest for the life of the VFS.
   - downloads/dashboard.html: `networkText()` renders reachable/unreachable/http-* only
     when doctor produced them ("(doctor)"), `unprobed` as "— not probed", and everything
     else as "— unknown (run doctor for a live probe)". A legacy payload's `online:false`
     lands in "unknown", never "Offline". The row label is "Network", not "Online".
   - Neither payload invents a probe: SystemModule stores no last-doctor verdict, so
     'unknown' is the honest value until one exists.

2. `vfsSize` in both payloads was a different unit again
   - aiassist: `JSON.stringify(fs.root).length / 1024`; world-model:
     `JSON.stringify(fs.root).length`. Same lie v4.6.160 fixed in `vfs-size` — UTF-16 code
     units plus serialisation structure. Both now sum UTF-8 bytes of file content
     (`_utf8Len`/`_measureVfs`, Blob → TextEncoder → code-point fallback, depth/node
     capped) and carry `sizeBytes` beside the human string so the rows reconcile.
   - world-model's `_gatherFileInfo().size` used a THIRD unit on an adjacent line
     (`JSON.stringify(fs.root).length/1024`); now the same measurement, plus `sizeBytes`.
   - `showModel()` renders exact bytes and tolerates a pre-fix persisted string.

3. Predictor made a guaranteed-401 request on every boot (UI-plan finding F6)
   - `_wdConfig()` returns `user:''`/`pass:''` when the saved WebDAV config has a URL but
     no credentials, and `_pullFromServer`/`_pushToServer` fetched the auth-gated
     `/spaces/<user>/_data/predictor.json` anyway — 107 × 401 in one day, logged by the
     browser as console errors. Both now refuse without credentials
     (`cache-only (no credentials)`).

Verified: 42/42 node tests, 2 new files (38 payload/honesty assertions, 8 predictor-store
assertions); the predictor suite is 4/8 against the pre-fix source, and the payload suite
fails 14 assertions against HEAD (`online:false` present, vfsSize === JSON.stringify
length). Live Chromium on v4.6.161, on the served dashboard: a legacy payload with
`online:false` renders "Network — unknown (run doctor for a live probe)", the current
payload renders "85.8 KB (87880 B)" and the same unknown, and a doctor-produced
`unreachable` renders "⚠️ unreachable (doctor)". Served bytes identical for
core-bundle.js, main.html and downloads/dashboard.html. `maintain.py --fix` all PASS.

9 files changed, 685 insertions, 22 deletions

diff --git a/downloads/dashboard.html b/downloads/dashboard.html
index 799bdbb..c217e1b 100644
--- a/downloads/dashboard.html
+++ b/downloads/dashboard.html
@@ -399,6 +399,19 @@
         }
     }
 
+    // Network is NEVER rendered as "Offline" from an unknown. The terminal payload stopped
+    // carrying an `online` boolean because navigator.onLine reports false on a fully connected
+    // Android WebView; `doctor` is the only thing that probes, and it is the only source that may
+    // produce a reachable/unreachable verdict. No verdict => 'unknown', never a red dot.
+    function networkText(health) {
+        const n = health && health.network;
+        if (n === 'reachable') return '✅ reachable (doctor)';
+        if (n === 'unreachable') return '⚠️ unreachable (doctor)';
+        if (typeof n === 'string' && n.indexOf('http-') === 0) return '⚠️ ' + n.replace('http-', 'HTTP ') + ' (doctor)';
+        if (n === 'unprobed') return '— not probed';
+        return '— unknown (run doctor for a live probe)';
+    }
+
     // 2026-10-22: a 10 s cutoff threw away perfectly good data and the page's own auto-refresh
     // then showed "Cannot connect". Keep whatever exists and let the UI label its age.
     function fetchDashboardData() {
@@ -578,8 +591,8 @@
         const health = data.health || {};
         let healthHtml = '';
         healthHtml += '<div class="metric-row"><span>Modules loaded</span><span>' + (health.modules || '?') + '</span></div>';
-        healthHtml += '<div class="metric-row"><span>VFS size</span><span>' + (health.vfsSize || '?') + '</span></div>';
-        healthHtml += '<div class="metric-row"><span>Online</span><span>' + (health.online ? '✅ Online' : '🔴 Offline') + '</span></div>';
+        healthHtml += '<div class="metric-row"><span>VFS size</span><span>' + (health.vfsSize || '?') + (typeof health.vfsSizeBytes === 'number' && health.vfsSizeBytes >= 1024 ? ' (' + health.vfsSizeBytes + ' B)' : '') + '</span></div>';
+        healthHtml += '<div class="metric-row"><span>Network</span><span>' + networkText(health) + '</span></div>';
         healthHtml += '<div class="metric-row"><span>Errors</span><span>' + (health.errors > 0 ? '⚠️ ' + health.errors : '✅ 0') + '</span></div>';
         healthHtml += '<div class="metric-row"><span>Predictor accuracy</span><span>' + (health.predictorAccuracy || 'N/A') + '</span></div>';
         healthDiv.innerHTML = healthHtml;
diff --git a/main.html b/main.html
index da1ca8f..71e1804 100644
--- a/main.html
+++ b/main.html
@@ -1350,13 +1350,13 @@
     </script>
 
     <!-- v4.5.63: A2A scratchpad fixes + agent-register arg fix -->
-<script src="modules/core/core-bundle.js?v=v4.6.160"></script>
+<script src="modules/core/core-bundle.js?v=v4.6.161"></script>
 
     <!-- Async dependency-ordered module loader now only initializes terminal and loads optional ext modules -->
-<script src="modules/core/module-loader.js?v=v4.6.160"></script>
+<script src="modules/core/module-loader.js?v=v4.6.161"></script>
 
     <!-- Critical ext bundle loads AFTER webx11 exists so registerModule calls work -->
-<script src="modules/ext/critical-ext-bundle.js?v=v4.6.160"></script>
+<script src="modules/ext/critical-ext-bundle.js?v=v4.6.161"></script>
 
 <script>
 // ═══ ONE TRUE VERSION SOURCE ═══
diff --git a/modules/core/core-bundle.js b/modules/core/core-bundle.js
index ddcac45..fe86c8f 100644
--- a/modules/core/core-bundle.js
+++ b/modules/core/core-bundle.js
@@ -14297,9 +14297,45 @@ maxFetchChars: this.maxFetchChars,
                                 }
                             };
                             walk('/');
-                            data.vfs = { files: fileCount, dirs: dirCount, size: (JSON.stringify(fs.root || {}).length / 1024).toFixed(1) + 'KB' };
+                            // Stored bytes: the UTF-8 length of each FILE's content, summed. The
+                            // old JSON.stringify(fs.root||{}).length counted UTF-16 code units
+                            // plus the serialisation structure (braces, quotes, keys, commas) —
+                            // ~2x for plain ASCII and wrong the other way for non-ASCII. This is
+                            // the unit `vfs-size` and `doctor` report.
+                            var u8 = function(s) {
+                                if (typeof s !== 'string' || s.length === 0) return 0;
+                                if (typeof Blob !== 'undefined') { try { return new Blob([s]).size; } catch (e) {} }
+                                if (typeof TextEncoder !== 'undefined') { try { return new TextEncoder().encode(s).length; } catch (e) {} }
+                                var n = 0;
+                                for (var j = 0; j < s.length; j++) {
+                                    var cp = s.codePointAt(j);
+                                    if (cp > 0xffff) j++;          // surrogate pair consumed
+                                    n += cp < 0x80 ? 1 : cp < 0x800 ? 2 : cp < 0x10000 ? 3 : 4;
+                                }
+                                return n;
+                            };
+                            var measure = function(node, depth) {
+                                var out = { bytes: 0, files: 0 };
+                                if (!node || !node.content || depth > 64) return out;
+                                for (var k in node.content) {
+                                    if (!Object.prototype.hasOwnProperty.call(node.content, k)) continue;
+                                    var c = node.content[k];
+                                    if (!c || typeof c !== 'object') continue;
+                                    if (c.type === 'file') { out.bytes += u8(c.content); out.files++; }
+                                    else { var sub = measure(c, depth + 1); out.bytes += sub.bytes; out.files += sub.files; }
+                                }
+                                return out;
+                            };
+                            var vfsB = measure(fs.root, 0);
+                            data.vfs = {
+                                files: fileCount, dirs: dirCount,
+                                sizeBytes: vfsB.bytes,
+                                size: vfsB.bytes < 1024 ? vfsB.bytes + ' B'
+                                    : vfsB.bytes < 1048576 ? (vfsB.bytes / 1024).toFixed(1) + ' KB'
+                                    : (vfsB.bytes / 1048576).toFixed(2) + ' MB'
+                            };
                         }
-                    } catch (e) { data.vfs = { files: 0, dirs: 0, size: '0KB' }; }
+                    } catch (e) { data.vfs = { files: 0, dirs: 0, size: '0 B', sizeBytes: 0 }; }
 
                     // Ollama
                     data.ollama = {
@@ -14359,7 +14395,15 @@ maxFetchChars: this.maxFetchChars,
                     data.health = {
                         modules: data.modules.loaded + '/' + data.modules.total,
                         vfsSize: data.vfs ? data.vfs.size : '?',
-                        online: typeof navigator !== 'undefined' ? navigator.onLine : true,
+                        vfsSizeBytes: data.vfs && typeof data.vfs.sizeBytes === 'number' ? data.vfs.sizeBytes : null,
+                        // NO `online` boolean. `navigator.onLine` reports false on a fully
+                        // connected Android WebView, which is how the debug panel and the
+                        // dashboard told working users they were offline. `doctor` owns the only
+                        // reachability verdict; SystemModule exposes no last verdict, so until one
+                        // is probed the honest value is 'unknown'.
+                        network: 'unknown',
+                        networkKnown: false,
+                        networkHint: 'run doctor for a live probe',
                         errors: totalErrors,
                         errorBreakdown: errCounts,
                         predictorAccuracy: predictorAcc
@@ -19954,6 +19998,10 @@ class PredictorModule {
     async _pushToServer() {
         const cfg = this._wdConfig();
         if (!cfg) { this._storeMode = 'cache-only (no WebDAV config)'; return false; }
+        // The store is a /spaces/<user>/_data path, i.e. auth-gated. A config without credentials
+        // produces a guaranteed 401 on every boot (measured: 107 × 401 on predictor.json in one day)
+        // and that 401 is what the console reports as an error. No credentials, no request.
+        if (!cfg.user || !cfg.pass) { this._storeMode = 'cache-only (no credentials)'; return false; }
         try {
             const body = this.terminal.fs.readFile('/system/metrics/predictor.json') || '{}';
             const put = () => fetch(this._storeUrl(cfg), { method: 'PUT', headers: this._storeHeaders(cfg), body: body });
@@ -19976,6 +20024,9 @@ class PredictorModule {
     async _pullFromServer(force) {
         const cfg = this._wdConfig();
         if (!cfg) { this._storeMode = 'cache-only (no WebDAV config)'; return false; }
+        // Same rule as the push: an auth-gated path read without credentials is a 401, not a
+        // "server (empty)" answer, and it costs a console error on every page load.
+        if (!cfg.user || !cfg.pass) { this._storeMode = 'cache-only (no credentials)'; return false; }
         if (!force && this._cacheStamp && (Date.now() - this._cacheStamp) < this._STORE_TTL_MS) return false;
         try {
             const resp = await fetch(this._storeUrl(cfg), { headers: this._storeHeaders(cfg) });
@@ -20173,6 +20224,65 @@ class WorldModelModule {
         }
     }
 
+    // ─── Measurement helpers ───
+
+    // UTF-8 byte length of a string. `JSON.stringify(root).length` — the unit vfsSize used to
+    // report — is UTF-16 string units PLUS every structural character of the serialisation
+    // (braces, quotes, keys, commas): it measured 1961 for a 1046-byte tree, and counts 'é' as 1.
+    // Blob is exact in the browser and in Node 22; TextEncoder is the fallback, then a manual
+    // code-point count (never `s.length`, which would reintroduce the UTF-16 lie).
+    _utf8Len(s) {
+        if (typeof s !== 'string' || s.length === 0) return 0;
+        if (typeof Blob !== 'undefined') {
+            try { return new Blob([s]).size; } catch (e) { /* fall through */ }
+        }
+        if (typeof TextEncoder !== 'undefined') {
+            try { return new TextEncoder().encode(s).length; } catch (e) { /* fall through */ }
+        }
+        let n = 0;
+        for (let i = 0; i < s.length; i++) {
+            const cp = s.codePointAt(i);
+            if (cp > 0xffff) i++;                       // surrogate pair consumed
+            n += cp < 0x80 ? 1 : cp < 0x800 ? 2 : cp < 0x10000 ? 3 : 4;
+        }
+        return n;
+    }
+
+    // Stored bytes of a VFS subtree: the UTF-8 length of each FILE's content, summed. A directory
+    // node contributes nothing of its own, so a nested tree is never double counted. This is the
+    // same unit `vfs-size` and `doctor` report. Depth- and node-capped so a malformed or cyclic
+    // tree cannot hang synthesis.
+    _measureVfs(root) {
+        const out = { bytes: 0, files: 0 };
+        let nodes = 0;
+        const walk = (node, depth) => {
+            if (!node || typeof node !== 'object' || depth > 64) return;
+            const kids = node.content;
+            if (!kids || typeof kids !== 'object') return;
+            for (const name of Object.keys(kids)) {
+                if (++nodes > 20000) return;
+                const child = kids[name];
+                if (!child || typeof child !== 'object') continue;
+                if (child.type === 'file') {
+                    out.bytes += this._utf8Len(child.content);
+                    out.files += 1;
+                } else {
+                    walk(child, depth + 1);
+                }
+            }
+        };
+        walk(root, 0);
+        return out;
+    }
+
+    // Human form for display; the exact byte count is printed beside it so the rows reconcile.
+    _fmtBytes(bytes) {
+        if (typeof bytes !== 'number' || !isFinite(bytes)) return '?';
+        if (bytes < 1024) return bytes + ' B';
+        if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
+        return (bytes / 1024 / 1024).toFixed(2) + ' MB';
+    }
+
     _gatherSystemInfo(fs, moduleCount, version) {
         // Get real health data from ServerMonitorModule's _latencyLog and DebugSupervisorModule
         const sm = this.terminal?.moduleManager?.modules?.['ServerMonitorModule'];
@@ -20180,11 +20290,18 @@ class WorldModelModule {
         const errorCount = ds ? Object.keys(ds._errorDB?.errors || {}).length : 0;
         const latencyErrors = sm?._latencyLog ? Object.values(sm._latencyLog).filter(e => e.status === 'error').length : 0;
         const totalErrors = errorCount + latencyErrors;
+        const vfs = this._measureVfs(fs?.root || null);
         return {
             version: `newOS4 ${version}`,
             modules: moduleCount || Object.keys(this.terminal?.moduleManager?.modules || {}).length || 0,
-            vfsSize: JSON.stringify(fs?.root || {}).length,
-            online: typeof navigator !== 'undefined' ? navigator.onLine : true,
+            // Stored bytes of file content — the one unit `vfs-size` and `doctor` report.
+            vfsSize: vfs.bytes,
+            vfsFiles: vfs.files,
+            // No reachability verdict is manufactured here. `navigator.onLine` reports false on a
+            // fully connected Android WebView, and `doctor` is the only place that probes. Until
+            // SystemModule exposes a last-doctor verdict, 'unknown' is the honest value.
+            network: 'unknown',
+            networkKnown: false,
             memory: typeof performance !== 'undefined' && performance.memory
                 ? `${(performance.memory.usedJSHeapSize / 1048576).toFixed(1)}MB`
                 : 'N/A',
@@ -20217,7 +20334,7 @@ class WorldModelModule {
     }
 
     _gatherFileInfo(fs) {
-        if (!fs) return { total: 0, size: '0KB' };
+        if (!fs) return { total: 0, size: '0 B', sizeBytes: 0 };
         let fileCount = 0, dirCount = 0;
         const walk = (path) => {
             const entries = fs.ls(path);
@@ -20233,10 +20350,14 @@ class WorldModelModule {
             }
         };
         walk('/');
+        // Same unit as system.vfsSize — the two are printed on adjacent lines, so they must
+        // reconcile. Stored UTF-8 bytes of file content, not JSON.stringify(fs.root).length.
+        const vfs = this._measureVfs(fs.root);
         return {
             total: fileCount,
             directories: dirCount,
-            size: `${(JSON.stringify(fs.root).length / 1024).toFixed(1)}KB`
+            size: this._fmtBytes(vfs.bytes),
+            sizeBytes: vfs.bytes
         };
     }
 
@@ -20372,7 +20493,14 @@ class WorldModelModule {
         this.terminal.print('🌐 World Model', 'header');
         this.terminal.print(`  Version: ${m.version} (last synthsized: ${new Date(m.synthesized).toLocaleTimeString()})`, 'info');
 
-        this.terminal.print(`  ⚙️  System — ${m.system.modules} modules loaded, ${m.system.vfsSize} VFS, ${m.system.memory}`, 'info');
+        // Tolerate a model loaded from VFS that predates the byte fix (vfsSize was a "1.9KB"
+        // string then): render whatever shape is there instead of "? B".
+        const vfsLine = typeof m.system.vfsSize === 'number'
+            ? (m.system.vfsSize < 1024
+                ? `${m.system.vfsSize} bytes`
+                : `${this._fmtBytes(m.system.vfsSize)} (${m.system.vfsSize} bytes)`)
+            : String(m.system.vfsSize);
+        this.terminal.print(`  ⚙️  System — ${m.system.modules} modules loaded, ${vfsLine} VFS, ${m.system.memory}`, 'info');
         this.terminal.print(`  🧩 Modules — ${m.modules.loaded} loaded (${m.modules.modifiedCount} modified)`, 'info');
         this.terminal.print(`  📁 Files — ${m.files.total} files, ${m.files.directories} dirs, ${m.files.size}`, 'info');
         this.terminal.print(`  📚 Skills — ${m.skills.count} installed`, 'info');
@@ -20616,6 +20744,14 @@ class WorldModelModule {
             if (!fs) return;
             const data = fs.fsReadJSON('/system/world-model.json');
             if (data) {
+                // A model persisted by a pre-v4.6.161 build carries `system.online` — a
+                // navigator.onLine boolean the digest would hand to the LLM as fact. Scrub it on
+                // load: no probe has run in this session, so 'unknown' is the honest value.
+                if (data.system && typeof data.system === 'object' && 'online' in data.system) {
+                    delete data.system.online;
+                    if (typeof data.system.network === 'undefined') data.system.network = 'unknown';
+                    data.system.networkKnown = false;
+                }
                 this._model = data;
                 this._lastRefresh = data.synthesized;
             }
diff --git a/modules/core/module-aiassist.js b/modules/core/module-aiassist.js
index a9b8fcc..84127d2 100644
--- a/modules/core/module-aiassist.js
+++ b/modules/core/module-aiassist.js
@@ -5118,9 +5118,45 @@ maxFetchChars: this.maxFetchChars,
                                 }
                             };
                             walk('/');
-                            data.vfs = { files: fileCount, dirs: dirCount, size: (JSON.stringify(fs.root || {}).length / 1024).toFixed(1) + 'KB' };
+                            // Stored bytes: the UTF-8 length of each FILE's content, summed. The
+                            // old JSON.stringify(fs.root||{}).length counted UTF-16 code units
+                            // plus the serialisation structure (braces, quotes, keys, commas) —
+                            // ~2x for plain ASCII and wrong the other way for non-ASCII. This is
+                            // the unit `vfs-size` and `doctor` report.
+                            var u8 = function(s) {
+                                if (typeof s !== 'string' || s.length === 0) return 0;
+                                if (typeof Blob !== 'undefined') { try { return new Blob([s]).size; } catch (e) {} }
+                                if (typeof TextEncoder !== 'undefined') { try { return new TextEncoder().encode(s).length; } catch (e) {} }
+                                var n = 0;
+                                for (var j = 0; j < s.length; j++) {
+                                    var cp = s.codePointAt(j);
+                                    if (cp > 0xffff) j++;          // surrogate pair consumed
+                                    n += cp < 0x80 ? 1 : cp < 0x800 ? 2 : cp < 0x10000 ? 3 : 4;
+                                }
+                                return n;
+                            };
+                            var measure = function(node, depth) {
+                                var out = { bytes: 0, files: 0 };
+                                if (!node || !node.content || depth > 64) return out;
+                                for (var k in node.content) {
+                                    if (!Object.prototype.hasOwnProperty.call(node.content, k)) continue;
+                                    var c = node.content[k];
+                                    if (!c || typeof c !== 'object') continue;
+                                    if (c.type === 'file') { out.bytes += u8(c.content); out.files++; }
+                                    else { var sub = measure(c, depth + 1); out.bytes += sub.bytes; out.files += sub.files; }
+                                }
+                                return out;
+                            };
+                            var vfsB = measure(fs.root, 0);
+                            data.vfs = {
+                                files: fileCount, dirs: dirCount,
+                                sizeBytes: vfsB.bytes,
+                                size: vfsB.bytes < 1024 ? vfsB.bytes + ' B'
+                                    : vfsB.bytes < 1048576 ? (vfsB.bytes / 1024).toFixed(1) + ' KB'
+                                    : (vfsB.bytes / 1048576).toFixed(2) + ' MB'
+                            };
                         }
-                    } catch (e) { data.vfs = { files: 0, dirs: 0, size: '0KB' }; }
+                    } catch (e) { data.vfs = { files: 0, dirs: 0, size: '0 B', sizeBytes: 0 }; }
 
                     // Ollama
                     data.ollama = {
@@ -5180,7 +5216,15 @@ maxFetchChars: this.maxFetchChars,
                     data.health = {
                         modules: data.modules.loaded + '/' + data.modules.total,
                         vfsSize: data.vfs ? data.vfs.size : '?',
-                        online: typeof navigator !== 'undefined' ? navigator.onLine : true,
+                        vfsSizeBytes: data.vfs && typeof data.vfs.sizeBytes === 'number' ? data.vfs.sizeBytes : null,
+                        // NO `online` boolean. `navigator.onLine` reports false on a fully
+                        // connected Android WebView, which is how the debug panel and the
+                        // dashboard told working users they were offline. `doctor` owns the only
+                        // reachability verdict; SystemModule exposes no last verdict, so until one
+                        // is probed the honest value is 'unknown'.
+                        network: 'unknown',
+                        networkKnown: false,
+                        networkHint: 'run doctor for a live probe',
                         errors: totalErrors,
                         errorBreakdown: errCounts,
                         predictorAccuracy: predictorAcc
diff --git a/modules/core/module-loader.js b/modules/core/module-loader.js
index 801bdb7..ce42652 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 = 'v4.6.160';
+    const LATEST_VER = 'v4.6.161';
     const CACHE = '?v=' + LATEST_VER;
     // Exposed so ext modules can register their own URL with the same cache-busting version
     // instead of an unversioned path the browser may already have cached (shell.js did).
diff --git a/modules/core/module-predictor.js b/modules/core/module-predictor.js
index b534d34..416b06b 100644
--- a/modules/core/module-predictor.js
+++ b/modules/core/module-predictor.js
@@ -444,6 +444,10 @@ class PredictorModule {
     async _pushToServer() {
         const cfg = this._wdConfig();
         if (!cfg) { this._storeMode = 'cache-only (no WebDAV config)'; return false; }
+        // The store is a /spaces/<user>/_data path, i.e. auth-gated. A config without credentials
+        // produces a guaranteed 401 on every boot (measured: 107 × 401 on predictor.json in one day)
+        // and that 401 is what the console reports as an error. No credentials, no request.
+        if (!cfg.user || !cfg.pass) { this._storeMode = 'cache-only (no credentials)'; return false; }
         try {
             const body = this.terminal.fs.readFile('/system/metrics/predictor.json') || '{}';
             const put = () => fetch(this._storeUrl(cfg), { method: 'PUT', headers: this._storeHeaders(cfg), body: body });
@@ -466,6 +470,9 @@ class PredictorModule {
     async _pullFromServer(force) {
         const cfg = this._wdConfig();
         if (!cfg) { this._storeMode = 'cache-only (no WebDAV config)'; return false; }
+        // Same rule as the push: an auth-gated path read without credentials is a 401, not a
+        // "server (empty)" answer, and it costs a console error on every page load.
+        if (!cfg.user || !cfg.pass) { this._storeMode = 'cache-only (no credentials)'; return false; }
         if (!force && this._cacheStamp && (Date.now() - this._cacheStamp) < this._STORE_TTL_MS) return false;
         try {
             const resp = await fetch(this._storeUrl(cfg), { headers: this._storeHeaders(cfg) });
diff --git a/modules/core/module-world-model.js b/modules/core/module-world-model.js
index 6e8f3c3..f7e2bbb 100644
--- a/modules/core/module-world-model.js
+++ b/modules/core/module-world-model.js
@@ -153,6 +153,65 @@ class WorldModelModule {
         }
     }
 
+    // ─── Measurement helpers ───
+
+    // UTF-8 byte length of a string. `JSON.stringify(root).length` — the unit vfsSize used to
+    // report — is UTF-16 string units PLUS every structural character of the serialisation
+    // (braces, quotes, keys, commas): it measured 1961 for a 1046-byte tree, and counts 'é' as 1.
+    // Blob is exact in the browser and in Node 22; TextEncoder is the fallback, then a manual
+    // code-point count (never `s.length`, which would reintroduce the UTF-16 lie).
+    _utf8Len(s) {
+        if (typeof s !== 'string' || s.length === 0) return 0;
+        if (typeof Blob !== 'undefined') {
+            try { return new Blob([s]).size; } catch (e) { /* fall through */ }
+        }
+        if (typeof TextEncoder !== 'undefined') {
+            try { return new TextEncoder().encode(s).length; } catch (e) { /* fall through */ }
+        }
+        let n = 0;
+        for (let i = 0; i < s.length; i++) {
+            const cp = s.codePointAt(i);
+            if (cp > 0xffff) i++;                       // surrogate pair consumed
+            n += cp < 0x80 ? 1 : cp < 0x800 ? 2 : cp < 0x10000 ? 3 : 4;
+        }
+        return n;
+    }
+
+    // Stored bytes of a VFS subtree: the UTF-8 length of each FILE's content, summed. A directory
+    // node contributes nothing of its own, so a nested tree is never double counted. This is the
+    // same unit `vfs-size` and `doctor` report. Depth- and node-capped so a malformed or cyclic
+    // tree cannot hang synthesis.
+    _measureVfs(root) {
+        const out = { bytes: 0, files: 0 };
+        let nodes = 0;
+        const walk = (node, depth) => {
+            if (!node || typeof node !== 'object' || depth > 64) return;
+            const kids = node.content;
+            if (!kids || typeof kids !== 'object') return;
+            for (const name of Object.keys(kids)) {
+                if (++nodes > 20000) return;
+                const child = kids[name];
+                if (!child || typeof child !== 'object') continue;
+                if (child.type === 'file') {
+                    out.bytes += this._utf8Len(child.content);
+                    out.files += 1;
+                } else {
+                    walk(child, depth + 1);
+                }
+            }
+        };
+        walk(root, 0);
+        return out;
+    }
+
+    // Human form for display; the exact byte count is printed beside it so the rows reconcile.
+    _fmtBytes(bytes) {
+        if (typeof bytes !== 'number' || !isFinite(bytes)) return '?';
+        if (bytes < 1024) return bytes + ' B';
+        if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
+        return (bytes / 1024 / 1024).toFixed(2) + ' MB';
+    }
+
     _gatherSystemInfo(fs, moduleCount, version) {
         // Get real health data from ServerMonitorModule's _latencyLog and DebugSupervisorModule
         const sm = this.terminal?.moduleManager?.modules?.['ServerMonitorModule'];
@@ -160,11 +219,18 @@ class WorldModelModule {
         const errorCount = ds ? Object.keys(ds._errorDB?.errors || {}).length : 0;
         const latencyErrors = sm?._latencyLog ? Object.values(sm._latencyLog).filter(e => e.status === 'error').length : 0;
         const totalErrors = errorCount + latencyErrors;
+        const vfs = this._measureVfs(fs?.root || null);
         return {
             version: `newOS4 ${version}`,
             modules: moduleCount || Object.keys(this.terminal?.moduleManager?.modules || {}).length || 0,
-            vfsSize: JSON.stringify(fs?.root || {}).length,
-            online: typeof navigator !== 'undefined' ? navigator.onLine : true,
+            // Stored bytes of file content — the one unit `vfs-size` and `doctor` report.
+            vfsSize: vfs.bytes,
+            vfsFiles: vfs.files,
+            // No reachability verdict is manufactured here. `navigator.onLine` reports false on a
+            // fully connected Android WebView, and `doctor` is the only place that probes. Until
+            // SystemModule exposes a last-doctor verdict, 'unknown' is the honest value.
+            network: 'unknown',
+            networkKnown: false,
             memory: typeof performance !== 'undefined' && performance.memory
                 ? `${(performance.memory.usedJSHeapSize / 1048576).toFixed(1)}MB`
                 : 'N/A',
@@ -197,7 +263,7 @@ class WorldModelModule {
     }
 
     _gatherFileInfo(fs) {
-        if (!fs) return { total: 0, size: '0KB' };
+        if (!fs) return { total: 0, size: '0 B', sizeBytes: 0 };
         let fileCount = 0, dirCount = 0;
         const walk = (path) => {
             const entries = fs.ls(path);
@@ -213,10 +279,14 @@ class WorldModelModule {
             }
         };
         walk('/');
+        // Same unit as system.vfsSize — the two are printed on adjacent lines, so they must
+        // reconcile. Stored UTF-8 bytes of file content, not JSON.stringify(fs.root).length.
+        const vfs = this._measureVfs(fs.root);
         return {
             total: fileCount,
             directories: dirCount,
-            size: `${(JSON.stringify(fs.root).length / 1024).toFixed(1)}KB`
+            size: this._fmtBytes(vfs.bytes),
+            sizeBytes: vfs.bytes
         };
     }
 
@@ -352,7 +422,14 @@ class WorldModelModule {
         this.terminal.print('🌐 World Model', 'header');
         this.terminal.print(`  Version: ${m.version} (last synthsized: ${new Date(m.synthesized).toLocaleTimeString()})`, 'info');
 
-        this.terminal.print(`  ⚙️  System — ${m.system.modules} modules loaded, ${m.system.vfsSize} VFS, ${m.system.memory}`, 'info');
+        // Tolerate a model loaded from VFS that predates the byte fix (vfsSize was a "1.9KB"
+        // string then): render whatever shape is there instead of "? B".
+        const vfsLine = typeof m.system.vfsSize === 'number'
+            ? (m.system.vfsSize < 1024
+                ? `${m.system.vfsSize} bytes`
+                : `${this._fmtBytes(m.system.vfsSize)} (${m.system.vfsSize} bytes)`)
+            : String(m.system.vfsSize);
+        this.terminal.print(`  ⚙️  System — ${m.system.modules} modules loaded, ${vfsLine} VFS, ${m.system.memory}`, 'info');
         this.terminal.print(`  🧩 Modules — ${m.modules.loaded} loaded (${m.modules.modifiedCount} modified)`, 'info');
         this.terminal.print(`  📁 Files — ${m.files.total} files, ${m.files.directories} dirs, ${m.files.size}`, 'info');
         this.terminal.print(`  📚 Skills — ${m.skills.count} installed`, 'info');
@@ -596,6 +673,14 @@ class WorldModelModule {
             if (!fs) return;
             const data = fs.fsReadJSON('/system/world-model.json');
             if (data) {
+                // A model persisted by a pre-v4.6.161 build carries `system.online` — a
+                // navigator.onLine boolean the digest would hand to the LLM as fact. Scrub it on
+                // load: no probe has run in this session, so 'unknown' is the honest value.
+                if (data.system && typeof data.system === 'object' && 'online' in data.system) {
+                    delete data.system.online;
+                    if (typeof data.system.network === 'undefined') data.system.network = 'unknown';
+                    data.system.networkKnown = false;
+                }
                 this._model = data;
                 this._lastRefresh = data.synthesized;
             }
diff --git a/modules/test/test-network-payload-honesty.js b/modules/test/test-network-payload-honesty.js
new file mode 100644
index 0000000..1f18725
--- /dev/null
+++ b/modules/test/test-network-payload-honesty.js
@@ -0,0 +1,298 @@
+// node modules/test/test-network-payload-honesty.js
+// Payload honesty: no payload may turn `navigator.onLine` into a network verdict, and the
+// world-model VFS size must be STORED UTF-8 BYTES.
+//
+// Why: an Android WebView reports navigator.onLine === false while the page is fully connected.
+// v4.6.159/160 removed that boolean from `status`, `doctor`, the status bar and the net test;
+// these are the two payloads that were left, plus every reader that printed "Offline" from them.
+//
+// Asserts (all on OUTPUT, never on a regex over source):
+//   · navigator.onLine === false must not produce `online: false` in the aiassist health payload,
+//     nor any online/offline claim in the world-model snapshot or its LLM digest;
+//   · world-model `vfsSize` == UTF-8 byte sum ('é' 2 + '☃' 3 + 1000 ASCII + 'abc' 3 = 1008),
+//     and != JSON.stringify(root).length (UTF-16 units + serialisation structure);
+//   · the consumer renders 'unknown': the real dashboard script is executed against a stub DOM
+//     and the actual health panel HTML is inspected; world-model's showModel output is captured;
+//   · a missing `navigator` does not throw.
+//
+// N4_CORE / N4_DASH point the same assertions at another build (mutation check).
+const fsMod = require('fs'), path = require('path');
+
+const CORE = process.env.N4_CORE || path.join(__dirname, '..', 'core');
+const DASH = process.env.N4_DASH || path.join(__dirname, '..', '..', 'downloads', 'dashboard.html');
+
+// ── browser globals the modules reach for ──────────────────────────────────
+const store = {};
+global.window = global;
+global.localStorage = {
+    getItem: k => (k in store ? store[k] : null),
+    setItem: (k, v) => { store[k] = String(v); },
+    removeItem: k => { delete store[k]; },
+};
+global.indexedDB = { open() { throw new Error('no idb'); }, deleteDatabase() { throw new Error('no idb'); } };
+global.NEWOS4_VERSION = 'v4.6.160-test';
+
+function setNavigator(onLine) {
+    if (onLine === 'missing') {
+        try { delete globalThis.navigator; } catch (e) { /* older node: shadow below */ }
+        try { Object.defineProperty(globalThis, 'navigator', { configurable: true, value: undefined }); } catch (e) {}
+        return;
+    }
+    Object.defineProperty(globalThis, 'navigator', {
+        configurable: true,
+        value: { onLine: onLine, userAgent: 'test-agent', storage: undefined },
+    });
+}
+
+// ── classes, loaded from source exactly as the bundle does ─────────────────
+const WorldModelModule = new Function(
+    fsMod.readFileSync(path.join(CORE, 'module-world-model.js'), 'utf8') + '\nreturn WorldModelModule;')();
+const AI = new Function(
+    fsMod.readFileSync(path.join(CORE, 'module-aiassist.js'), 'utf8') + '\nreturn WebX11AIAssistantModule;')();
+
+let fails = 0, passes = 0;
+function ok(name, cond, detail) {
+    if (cond) { passes++; return; }
+    fails++;
+    console.log('FAIL ' + name + (detail ? ' — ' + detail : ''));
+}
+
+// ── the honest tree: 'é' = 2 B, '☃' = 3 B, 1000 ASCII, nested 'abc' = 3 B ──
+const EXPECTED_BYTES = 2 + 3 + 1000 + 3;      // 1008 stored bytes
+function makeTree() {
+    return {
+        type: 'dir',
+        content: {
+            'e.txt': { type: 'file', content: 'é' },
+            's.txt': { type: 'file', content: '☃' },
+            'ascii.txt': { type: 'file', content: 'x'.repeat(1000) },
+            'sub': { type: 'dir', content: { 'n.txt': { type: 'file', content: 'abc' } } },
+        },
+    };
+}
+
+// ── an in-memory VFS with only the methods these modules call ──────────────
+function mkFs(root) {
+    const writes = new Map(), json = new Map();
+    const resolve = (p) => {
+        if (!p || p === '/') return root;
+        const parts = String(p).replace(/^\/+|\/+$/g, '').split('/').filter(Boolean);
+        let node = root;
+        for (const part of parts) {
+            node = node && node.content && node.content[part];
+            if (!node) return null;
+        }
+        return node || null;
+    };
+    const fs = {
+        root,
+        currentPath: [],
+        writes,
+        ls(p) {
+            const node = resolve(p || '/');
+            if (!node || !node.content) return [];
+            return Object.keys(node.content).map(name => ({
+                name, type: node.content[name].type, _virtual: false,
+            }));
+        },
+        readDir(p) { return fs.ls(p); },
+        readFile(p) {
+            if (writes.has(p)) return writes.get(p);
+            const n = resolve(p);
+            return n && n.type === 'file' ? (n.content || '') : null;
+        },
+        writeFile(p, c) { writes.set(p, String(c)); return true; },
+        deleteFile(p) { writes.delete(p); return true; },
+        mkdir() { return true; },
+        fsWriteJSON(p, obj) { json.set(p, obj); writes.set(p, JSON.stringify(obj)); return true; },
+        fsReadJSON(p) {
+            if (json.has(p)) return json.get(p);
+            if (writes.has(p)) { try { return JSON.parse(writes.get(p)); } catch (e) { return null; } }
+            const n = resolve(p);
+            if (n && n.type === 'file') { try { return JSON.parse(n.content); } catch (e) { return null; } }
+            return null;
+        },
+    };
+    return fs;
+}
+
+function mkTerminal(fs, wm) {
+    const out = [];
+    return {
+        out,
+        text: () => out.map(l => l.msg).join('\n'),
+        fs,
+        ollamaManager: { connected: false, currentModel: null, currentProvider: null },
+        moduleManager: {
+            modules: wm ? { WorldModelModule: wm } : {},
+            moduleRegistry: [{ name: 'A' }, { name: 'B' }],
+            getAllCommands: () => ({}),
+        },
+        countErrors: () => ({ total: 0, debug: 0, latency: 0, log: 0 }),
+        print: (msg, cls) => out.push({ msg: String(msg), cls: cls || '' }),
+    };
+}
+
+function newWorldModel() {
+    const wm = new WorldModelModule();
+    wm.terminal = mkTerminal(mkFs(makeTree()));
+    wm._synthesize();
+    return wm;
+}
+
+async function aiassistPayload(wm) {
+    const ai = Object.create(AI.prototype);
+    ai.terminal = mkTerminal(mkFs(makeTree()), wm);
+    return await ai._collectDashboardData();
+}
+
+// ══════════════════════════════════════════════════════════════════════════
+// A/B. navigator.onLine === false must not become a payload fact
+// ══════════════════════════════════════════════════════════════════════════
+(async function main() {
+    setNavigator(false);
+    const wm = newWorldModel();
+    const data = await aiassistPayload(wm);
+
+    // ── A. aiassist health payload (debug panel / dashboard source) ──
+    const health = (data && data.health) || {};
+    ok('A1 health payload has no `online` key',
+        !Object.prototype.hasOwnProperty.call(health, 'online'), JSON.stringify(health));
+    ok('A2 serialised health carries no "online"',
+        JSON.stringify(health).indexOf('"online"') === -1, JSON.stringify(health));
+    ok('A3 health.network is "unknown"', health.network === 'unknown', String(health.network));
+    ok('A4 health.networkKnown is false', health.networkKnown === false, String(health.networkKnown));
+    ok('A5 health.vfsSizeBytes is the UTF-8 sum',
+        health.vfsSizeBytes === EXPECTED_BYTES, String(health.vfsSizeBytes));
+    ok('A6 health.vfsSize is a byte figure, not JSON length',
+        typeof health.vfsSize === 'string' && /B$/.test(health.vfsSize.trim()), String(health.vfsSize));
+    ok('A7 whole payload contains no "online":false',
+        JSON.stringify(data).indexOf('"online":false') === -1);
+    ok('A8 aiassist vfs bytes differ from JSON.stringify(root).length',
+        health.vfsSizeBytes !== JSON.stringify(makeTree()).length,
+        health.vfsSizeBytes + ' vs ' + JSON.stringify(makeTree()).length);
+
+    // ── B. world-model snapshot + LLM digest ──
+    const sys = (wm._model && wm._model.system) || {};
+    ok('B1 world-model system has no `online` key',
+        !Object.prototype.hasOwnProperty.call(sys, 'online'), JSON.stringify(sys));
+    ok('B2 world-model network is "unknown"', sys.network === 'unknown', String(sys.network));
+    ok('B3 world-model networkKnown is false', sys.networkKnown === false, String(sys.networkKnown));
+    const snap = JSON.stringify(wm._modelSnapshot());
+    ok('B4 snapshot has no "online" field', snap.indexOf('"online"') === -1);
+    ok('B5 snapshot states network unknown', /"network":"unknown"/.test(snap));
+    const digest = wm._modelDigest();
+    ok('B6 digest makes no Online/Offline claim',
+        !/\b(Online|Offline)\b/.test(digest), digest.slice(0, 200));
+    ok('B7 world-model vfsSize is the UTF-8 sum',
+        sys.vfsSize === EXPECTED_BYTES, String(sys.vfsSize));
+    ok('B8 vfsSize differs from JSON.stringify(root).length',
+        sys.vfsSize !== JSON.stringify(makeTree()).length,
+        sys.vfsSize + ' vs ' + JSON.stringify(makeTree()).length);
+    ok('B9 files.sizeBytes reconciles with system.vfsSize',
+        wm._model.files.sizeBytes === sys.vfsSize, wm._model.files.sizeBytes + ' vs ' + sys.vfsSize);
+
+    // ── C. the UTF-8 unit itself, one file at a time (no averaging) ──
+    // Guarded so a missing helper FAILS an assertion instead of aborting the run.
+    const u8len = (s) => (typeof wm._utf8Len === 'function' ? wm._utf8Len(s) : NaN);
+    const measure = (n) => (typeof wm._measureVfs === 'function' ? wm._measureVfs(n) : { bytes: NaN, files: NaN });
+    ok('C1 é counts as 2 bytes', u8len('é') === 2, String(u8len('é')));
+    ok('C2 ☃ counts as 3 bytes', u8len('☃') === 3, String(u8len('☃')));
+    ok('C3 a nested dir adds only its own file content',
+        measure(makeTree().content['sub']).bytes === 3, String(measure(makeTree().content['sub']).bytes));
+    ok('C4 measure counts files, not directories',
+        measure(makeTree()).files === 4, String(measure(makeTree()).files));
+
+    // ══════════════════════════════════════════════════════════════════════
+    // D. the consumer renders 'unknown' — real dashboard script, stub DOM
+    // ══════════════════════════════════════════════════════════════════════
+    const dashHtml = fsMod.readFileSync(DASH, 'utf8');
+    let dashScript = null;
+    for (const m of dashHtml.matchAll(/<script>([\s\S]*?)<\/script>/g)) {
+        if (m[1].includes('function networkText')) { dashScript = m[1]; break; }
+    }
+    ok('D0 dashboard script with networkText found', !!dashScript, DASH);
+
+    function renderHealth(healthPayload) {
+        const els = new Map();
+        const el = (id) => {
+            if (!els.has(id)) els.set(id, { id, textContent: '', innerHTML: '', className: '', style: {} });
+            return els.get(id);
+        };
+        const payload = {
+            version: 'v4.6.160-test',
+            timestamp: Date.now(),
+            modules: { loaded: 2, total: 2, modifiedCount: 0 },
+            agents: { total: 0, busy: 0, idle: 0, list: [] },
+            memory: { heap: '1MB', graphNodes: 0 },
+            vfs: { files: 4, dirs: 2, size: healthPayload.vfsSize, sizeBytes: healthPayload.vfsSizeBytes },
+            ollama: { connected: false },
+            skills: { count: 0 },
+            latency: [],
+            health: healthPayload,
+        };
+        const store2 = { webx11_dashboard_data: JSON.stringify(payload) };
+        const ls = {
+            getItem: k => (k in store2 ? store2[k] : null),
+            setItem: (k, v) => { store2[k] = String(v); },
+            removeItem: k => { delete store2[k]; },
+        };
+        const win = { addEventListener() {}, refreshNow: null };
+        const run = new Function('document', 'window', 'localStorage', 'setInterval', 'clearInterval', dashScript);
+        run({ getElementById: el }, win, ls, () => 0, () => {});
+        return el('health-metrics').innerHTML;
+    }
+
+    if (dashScript) {
+        const h1 = renderHealth({ modules: '2/2', vfsSize: '1008 B', vfsSizeBytes: 1008, network: 'unknown', networkKnown: false, errors: 0 });
+        ok('D1 unknown renders as unknown', /unknown/.test(h1), h1);
+        ok('D2 unknown never renders Offline', !/Offline/.test(h1), h1);
+        ok('D3 unknown never renders Online', !/Online/.test(h1), h1);
+        ok('D4 health panel still labels the row Network', /<span>Network<\/span>/.test(h1), h1);
+        ok('D5 VFS row shows the byte figure', /1008 B/.test(h1), h1);
+
+        // A payload from an older bundle: `online: false` must not become "Offline".
+        const h2 = renderHealth({ modules: '2/2', vfsSize: '1.9KB', online: false, errors: 0 });
+        ok('D6 legacy online:false does not render Offline', !/Offline/.test(h2), h2);
+        ok('D7 legacy online:false renders unknown', /unknown/.test(h2), h2);
+
+        // The doctor verdict path still works when a verdict exists.
+        const h3 = renderHealth({ modules: '2/2', vfsSize: '1008 B', network: 'reachable', networkKnown: true, errors: 0 });
+        ok('D8 a doctor verdict is shown as reachable', /reachable/.test(h3), h3);
+        ok('D9 reachable is not rendered as Offline', !/Offline/.test(h3), h3);
+    }
+
+    // ── E. world-model's own renderer ──
+    wm.showModel();
+    const shown = wm.terminal.text();
+    ok('E1 world-model output makes no Online/Offline claim',
+        !/\b(Online|Offline)\b/.test(shown), shown);
+    ok('E2 world-model output prints the byte count', /1008 bytes/.test(shown), shown);
+
+    // ══════════════════════════════════════════════════════════════════════
+    // F. no navigator at all must not throw, and must not invent a verdict
+    // ══════════════════════════════════════════════════════════════════════
+    setNavigator('missing');
+    ok('F0 navigator really is absent', typeof navigator === 'undefined', typeof navigator);
+    let thrown = null, data2 = null, wm2 = null;
+    try {
+        wm2 = newWorldModel();
+        data2 = await aiassistPayload(wm2);
+    } catch (e) { thrown = e; }
+    ok('F1 missing navigator does not throw', thrown === null, thrown && thrown.message);
+    ok('F2 aiassist health still says unknown without navigator',
+        data2 && data2.health && data2.health.network === 'unknown' && data2.health.networkKnown === false);
+    ok('F3 world-model snapshot still says unknown without navigator',
+        wm2 && wm2._model && wm2._model.system.network === 'unknown' && wm2._model.system.networkKnown === false);
+    ok('F4 no online key appears when navigator is absent',
+        !data2 || JSON.stringify(data2).indexOf('"online"') === -1);
+
+    console.log('');
+    console.log(passes + '/' + (passes + fails) + ' assertions passed');
+    if (fails > 0) {
+        console.log('RESULT: FAIL — ' + fails + ' assertion(s) failed');
+        process.exit(1);
+    }
+    console.log('RESULT: PASS — no payload or reader turns navigator.onLine into a verdict, vfsSize is UTF-8 bytes');
+    process.exit(0);
+})();
diff --git a/modules/test/test-predictor-store-auth.js b/modules/test/test-predictor-store-auth.js
new file mode 100644
index 0000000..6c37812
--- /dev/null
+++ b/modules/test/test-predictor-store-auth.js
@@ -0,0 +1,80 @@
+// node modules/test/test-predictor-store-auth.js
+// F6 (2026-11-09): the predictor store is an auth-gated /spaces/<user>/_data path, but _wdConfig()
+// returns user:''/pass:'' whenever the saved WebDAV config has no credentials — so every page load
+// made a guaranteed-401 request (measured 107 in one day) and the console reported it as an error.
+// No credentials must mean no request.
+const fs = require('fs');
+const path = require('path');
+const SRC = process.env.PRED_SRC || path.join(__dirname, '..', 'core', 'module-predictor.js');
+const src = fs.readFileSync(SRC, 'utf8');
+
+let pass = 0, fail = 0;
+const ok = (name, cond, detail) => {
+  if (cond) { pass++; console.log('ok   ' + name); }
+  else { fail++; console.log('FAIL ' + name + (detail !== undefined ? ' — ' + detail : '')); }
+};
+
+function load(localStore) {
+  const store = Object.assign({}, localStore);
+  global.localStorage = {
+    getItem: (k) => (k in store ? store[k] : null),
+    setItem: (k, v) => { store[k] = String(v); },
+    removeItem: (k) => { delete store[k]; },
+  };
+  global.window = global;
+  global.setTimeout = global.setTimeout;
+  const Mod = new Function(src + '\nreturn PredictorModule;')();
+  const m = new Mod();
+  m.terminal = {
+    print: () => {},
+    fs: {
+      readFile: () => '{}',
+      fsReadJSON: () => null,
+      fsWriteJSON: () => true,
+      readDir: () => [],
+      mkdirRecursive: () => true,
+    },
+  };
+  return m;
+}
+
+(async () => {
+  const cfgNoCreds = JSON.stringify({ url: 'https://webx11.duckdns.org/spaces/agando', user: '', password: '' });
+  const cfgWithCreds = JSON.stringify({ url: 'https://webx11.duckdns.org/spaces/agando', user: 'agando', password: 'pw' });
+
+  // ---- 1. no credentials → zero requests, both directions ----
+  let calls = 0;
+  global.fetch = () => { calls++; return Promise.resolve({ ok: true, status: 200, json: async () => ({}) }); };
+  let m = load({ webx11_webdav_config: cfgNoCreds });
+  const pulled = await m._pullFromServer(true);
+  const pushed = await m._pushToServer();
+  ok('pull without credentials returns false', pulled === false);
+  ok('push without credentials returns false', pushed === false);
+  ok('no fetch was made without credentials', calls === 0, 'calls=' + calls);
+  ok('store mode names the reason', /no credentials/.test(m._storeMode), m._storeMode);
+
+  // ---- 2. credentials present → still talks to the server ----
+  calls = 0;
+  let sawAuth = null;
+  global.fetch = (url, opts) => {
+    calls++;
+    sawAuth = opts && opts.headers && opts.headers.Authorization;
+    return Promise.resolve({ ok: true, status: 200, json: async () => ({ dataPoints: [], accuracy: { total: 0 } }) });
+  };
+  m = load({ webx11_webdav_config: cfgWithCreds });
+  await m._pullFromServer(true);
+  ok('pull with credentials reaches the server', calls === 1, 'calls=' + calls);
+  ok('pull sends an Authorization header', /^Basic /.test(String(sawAuth)), String(sawAuth));
+  ok('store mode becomes server', m._storeMode === 'server', m._storeMode);
+
+  // ---- 3. no config at all → no request (unchanged behaviour) ----
+  calls = 0;
+  global.fetch = () => { calls++; return Promise.resolve({ ok: true, status: 200 }); };
+  m = load({});
+  await m._pullFromServer(true);
+  await m._pushToServer();
+  ok('no config still makes no request', calls === 0, 'calls=' + calls);
+
+  console.log('\ntest-predictor-store-auth: ' + pass + ' passed, ' + fail + ' failed');
+  process.exit(fail ? 1 : 0);
+})().catch((e) => { console.error('HARNESS ERROR', e); process.exit(2); });