feat(nodes): live CPU/RAM/disk monitoring in the node list

- node-agent: internal/metrics — read CPU% (GetSystemTimes), RAM (GlobalMemoryStatusEx),
  disk used%/total (GetDiskFreeSpaceEx) via stdlib kernel32 (no external dep; windows
  build + non-windows stub). Heartbeat now reports cpu_pct/ram_available_mb/disk_used_pct/
  disk_total_gb + ae_running.
- render-svc: heartbeat persists last_disk_pct + disk_total_gb (migration 29); RenderNode
  model + node SELECT/scan carry them.
- admin: rewrite NodesTable to the real RenderNode shape (fixes a pre-existing items/V2Node
  mismatch that left the list empty) + a CPU/RAM/disk bars column + stale-heartbeat flag.
- assets-bundle ingestion: ProjectMediaBundle (jszip) auto-maps project.zip → project/scene
  image/demo/colour + music; PatchProject gains image/full_demo/shared_colors_svg.
- scan: RGBA (4-number) colours recognised + frshare single-int controls detected.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/node-agent/internal/runner/scan.jsx

@@ -63,18 +63,22 @@
     function trim(s) { return String(s).replace(/^\s+|\s+$/g, ""); }
     function isColor(s) {
         if (!s) return false; s = trim(s);
-        return /^#?[0-9a-fA-F]{6}$/.test(s) || /^\d{1,3}\s*,\s*\d{1,3}\s*,\s*\d{1,3}$/.test(s);
+        // hex, RGB (3 numbers) or RGBA (4 numbers — the FIX/frshare format, e.g. 253,226,228,255)
+        return /^#?[0-9a-fA-F]{6}$/.test(s) || /^\d{1,3}\s*,\s*\d{1,3}\s*,\s*\d{1,3}(\s*,\s*\d{1,3})?$/.test(s);
     }
     function normColor(s) {
         s = trim(s);
         if (/^[0-9a-fA-F]{6}$/.test(s)) return "#" + s;               // bare hex → add #
-        var m = s.match(/^(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})$/); // r,g,b → #hex
+        var m = s.match(/^(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})(?:\s*,\s*\d{1,3})?$/); // r,g,b[,a] → #hex (alpha dropped)
         if (m) {
             function h(n) { n = Math.max(0, Math.min(255, parseInt(n, 10))); var x = n.toString(16); return x.length === 1 ? "0" + x : x; }
             return "#" + h(m[1]) + h(m[2]) + h(m[3]);
         }
         return s;
     }
+    // A frshare control layer holds a single integer (e.g. 0-3) that an expression
+    // reads to switch a design variant (e.g. logo = image vs fill-colour overlay).
+    function isControl(s) { return /^\s*\d+\s*$/.test(String(s)); }
 
     function justifyName(j) {
         try {
@@ -139,25 +143,29 @@
         return false;
     }
 
-    // ── frshare colours (shared by all modes) ──────────────────────────────────
-    function readSharedColors(proj) {
-        var colors = [];
+    // ── frshare: shared colours (RGBA) + shared controls (single 0-3 number) ────
+    function readShared(proj) {
+        var colors = [], controls = [];
         for (var i = 1; i <= proj.numItems; i++) {
             var item = proj.item(i);
             if (!(item instanceof CompItem) || item.name !== "frshare") continue;
             for (var j = 1; j <= item.numLayers; j++) {
                 var cl = item.layer(j), ct = readText(cl);
-                if (ct && isColor(ct.text)) {
+                if (!ct) continue;
+                if (isColor(ct.text)) {
                     colors.push({ element_key: cl.name, title: cl.name, attr_value: "fill", default_color: normColor(ct.text), sort: j });
+                } else if (isControl(ct.text)) {
+                    controls.push({ element_key: cl.name, title: cl.name, default_value: trim(ct.text), min: 0, max: 3, sort: j });
                 }
             }
         }
-        return colors;
+        return { colors: colors, controls: controls };
     }
 
     // ── FLEXIBLE / Mockup — each scene IS a comp; layers frl_/frd_ inside ───────
     function scanFlexible(proj) {
-        var result = { source: "ae-jsx", render_comp: null, scenes: [], shared_colors: readSharedColors(proj) };
+        var sh = readShared(proj);
+        var result = { source: "ae-jsx", render_comp: null, scenes: [], shared_colors: sh.colors, shared_controls: sh.controls };
         for (var i = 1; i <= proj.numItems; i++) {
             var item = proj.item(i);
             if (!(item instanceof CompItem)) continue;
@@ -177,7 +185,8 @@
 
     // ── FIX / MusicVisualizer — scenes encoded in layer names frl_c(x)t/m(y) ────
     function scanFix(proj) {
-        var result = { source: "ae-jsx", render_comp: "frfinal", scenes: [], shared_colors: readSharedColors(proj) };
+        var sh = readShared(proj);
+        var result = { source: "ae-jsx", render_comp: "frfinal", scenes: [], shared_colors: sh.colors, shared_controls: sh.controls };
         var sceneMap = {}, order = [];
         var re = /^frl_c(\d+)([tm])(\d+)$/;
         for (var i = 1; i <= proj.numItems; i++) {