feat(03-04): Worker [assets] binding + one-command deploy + D-14 build-artifact gate

- wrangler.jsonc assets block serves ../web/dist; run_worker_first keeps /api/* + /telegram/* on the Worker (D-13)
- root npm run deploy = build theme → web → bot wrangler deploy + set-webhook (D-15); dev = build + wrangler dev --port 8787 --local (D-12)
- vite.config.ts dual-build: __ARAHARAH_HARNESS__ define keyed on --mode harness, separate dist/dist-harness outDirs
- main.ts guard unchanged; ambient constant declared once in web/src/vite-env.d.ts
- build-artifact.test.mjs BA1..BA6: zero CDN refs, self-hosted fonts, MapLibre worker, inlined style, no mock installer in ANY emitted file (HTML included)

web/package.json

@@ -7,6 +7,7 @@
     "typecheck": "tsc --noEmit",
     "dev": "vite",
     "build": "vite build",
+    "build:harness": "vite build --mode harness",
     "capture": "node scripts/capture.mjs"
   },
   "dependencies": {