fix(core,cli,ci): harden runtime resolution + inline constant + smoke test (#458)

Guard buildHyperframesRuntimeScript() against missing entry.ts so it
returns null instead of crashing with esbuild stderr output. Add
getHyperframeRuntimeScript() that returns the pre-built IIFE as a
baked-in string constant — no esbuild, no file I/O, no import.meta.url.

Consolidate CLI runtime source resolution into a single module with
a clear priority chain: esbuild from source (dev) → inlined constant
(production) → pre-built artifact file (fallback).

Add CI smoke test that npm-packs the CLI, installs globally, runs
hyperframes preview, and asserts no stderr errors + runtime endpoint
returns JS.

Bump version to 0.4.16.

packages/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/core",
-  "version": "0.4.15",
+  "version": "0.4.16",
   "description": "",
   "repository": {
     "type": "git",
@@ -80,7 +80,7 @@
     "types": "./dist/index.d.ts"
   },
   "scripts": {
-    "build": "tsc && bun run build:hyperframes-runtime",
+    "build": "bun run build:hyperframes-runtime && tsc",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",