Add Gitea runner build workflow

.codex/project.md

@@ -30,6 +30,14 @@ git diff --check
 
 There is no separate lint script yet. `npm run build` runs `tsc --noEmit` before the Vite build. There is no audit or release-check script yet.
 
+Build and test verification should run on the Gitea runner with:
+
+```text
+.gitea/workflows/build.yml
+```
+
+The local machine is not the source of truth for CI results.
+
 ## Stack
 
 ```text
@@ -46,12 +54,12 @@ npm
 
 Release artifacts are produced in:
 
-Expected files:
-
 ```text
 dist/
 ```
 
+The Gitea build workflow uploads `dist/` as the `league-of-legends-gui-overhaul-dist` workflow artifact.
+
 ## Security Rules
 
 - Do not commit secrets, tokens, `.env` files, certificates, or private keys.