build: PaddedCell-style install.mjs + SDK-aligned packaging

install.mjs (--install/--build-only/--uninstall/--openclaw-profile-path),
tsconfig outDir dist/fabric, package.json openclaw file dep + main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dist/fabric/src/setup-entry.js

@@ -0,0 +1,14 @@
+// Setup-safe entry: returns channel metadata for read-only command paths
+// (status, channels list) before the plugin runtime starts. Must NOT start
+// clients, listeners, or transports.
+export default {
+    channel: {
+        id: 'fabric',
+        label: 'Fabric',
+        blurb: 'Connect OpenClaw agents to a Fabric guild.',
+    },
+    inspect(cfg) {
+        const ok = Boolean(cfg?.channels?.['fabric']?.centerApiBase);
+        return { enabled: ok, configured: ok };
+    },
+};