feat(engine): re-pin vendored engines

automated re-pin, all gates green, goldens byte-identical

webindex v1.18.3 -> v1.18.4
 3 files changed, 7 insertions(+), 7 deletions(-)

Author: github-actions[bot]

src/vendor/webindex-engine.d.mts

@@ -1,7 +1,7 @@
 import { Readable, Writable } from 'node:stream';
 import { Server } from 'node:http';
 
-declare const ENGINE_VERSION = "1.18.3";
+declare const ENGINE_VERSION = "1.18.4";
 
 interface Brand {
     /** Human-readable engine consumer, used in notes and diagnostics. */

src/vendor/webindex-engine.mjs

@@ -1,5 +1,5 @@
 // src/version.ts
-var ENGINE_VERSION = "1.18.3";
+var ENGINE_VERSION = "1.18.4";
 
 // src/brand.ts
 var DEFAULT_BRAND = {