chore: remove root long and rolldown deps (#22481)

* chore(deadcode): add deadcode scanning and remove unused lockfile deps

* chore(changelog): mention deadcode CI scan pass

* ci: disable deadcode job temporarily

* docs(changelog): add PR ref and thanks for deadcode scan entry

* ci: comment out deadcode job condition while keeping it disabled

* Deps: remove dead root dependency from package manifest

* Changelog: reference PR for deadcode dependency cleanup

* Deps: remove unused root signal-utils

* Chore: remove unused lit context deps

* Chore: remove unused root lit dependency

* Chore: remove root long and rolldown deps

* Chore: add changelog for root long/rolldown removal

* Chore: fix a2ui bundling after root lit dependency removal

* Chore: simplify a2ui bundle script dependencies

package.json

@@ -174,7 +174,6 @@
     "json5": "^2.2.3",
     "jszip": "^3.10.1",
     "linkedom": "^0.18.12",
-    "long": "^5.3.2",
     "markdown-it": "^14.1.1",
     "node-edge-tts": "^1.2.10",
     "opusscript": "^0.0.8",
@@ -193,8 +192,6 @@
   },
   "devDependencies": {
     "@grammyjs/types": "^3.24.0",
-    "@lit-labs/signals": "^0.2.0",
-    "@lit/context": "^1.1.6",
     "@types/express": "^5.0.6",
     "@types/markdown-it": "^14.1.2",
     "@types/node": "^25.3.0",
@@ -202,12 +199,9 @@
     "@types/ws": "^8.18.1",
     "@typescript/native-preview": "7.0.0-dev.20260219.1",
     "@vitest/coverage-v8": "^4.0.18",
-    "lit": "^3.3.2",
-    "ollama": "^0.6.3",
     "oxfmt": "0.33.0",
     "oxlint": "^1.48.0",
     "oxlint-tsgolint": "^0.14.1",
-    "rolldown": "1.0.0-rc.5",
     "tsdown": "^0.20.3",
     "tsx": "^4.21.0",
     "typescript": "^5.9.3",