v1.60.3-beta.1: harden rendering and QA tooling

rollup.config.mjs

@@ -2,6 +2,9 @@ import typescript from '@rollup/plugin-typescript';
 import json from '@rollup/plugin-json';
 import resolve from '@rollup/plugin-node-resolve';
 import terser from '@rollup/plugin-terser';
+import { sourceFingerprint } from './scripts/source-fingerprint.mjs';
+
+const SOURCE_FINGERPRINT = sourceFingerprint();
 
 export default {
   input: 'src/houseplan-card.ts',
@@ -9,6 +12,10 @@ export default {
     file: 'dist/houseplan-card.js',
     format: 'es',
     sourcemap: false,
+    // Tooling reads this before recording screenshots/performance. A committed
+    // demo bundle built from older sources must fail closed, never produce a
+    // plausible-looking but invalid baseline.
+    intro: `globalThis.__HOUSEPLAN_BUILD_FINGERPRINT__=${JSON.stringify(SOURCE_FINGERPRINT)};`,
   },
   plugins: [resolve(), json(), typescript(), terser({ format: { comments: false } })],
 };