ci: drop actions/upload-artifact@v4 (incompatible with Gitea runner)

upload-artifact@v4 needs GitHub's artifact backend, which the Gitea
act_runner doesn't implement — it failed the build job with exit 1 even
though build:embedded + smoke-check passed. The publish job rebuilds from
source, so the artifact was only a convenience.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -47,8 +47,8 @@ jobs:
       - name: Build embedded
         # build:embedded writes to the repo-root dist/ (vite default outDir).
         # Stage it into embedded/web/dist — the publish template's "files" entry
-        # — so the smoke-check, artifact upload, and npm publish all see the
-        # bundle. (embedded/web/dist is gitignored, hence the explicit copy.)
+        # — so the smoke-check and npm publish both see the bundle.
+        # (embedded/web/dist is gitignored, hence the explicit copy.)
         run: |
           pnpm run build:embedded
           rm -rf embedded/web/dist
@@ -65,12 +65,11 @@ jobs:
           ls embedded/web/dist >> "$GITHUB_STEP_SUMMARY"
           echo '```' >> "$GITHUB_STEP_SUMMARY"
 
-      - name: Upload dist artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: element-call-embedded-dist
-          path: embedded/web/dist
-          retention-days: 7
+      # NOTE: no actions/upload-artifact step — v4 requires GitHub's artifact
+      # backend, which the Gitea act_runner does not implement (it fails with
+      # exit 1). The publish job rebuilds from source anyway, so the artifact
+      # was only a convenience; re-add a Gitea-compatible action here if per-run
+      # dist downloads are ever needed.
 
   publish:
     name: Publish to Gitea npm registry
@@ -98,8 +97,8 @@ jobs:
       - name: Build embedded
         # build:embedded writes to the repo-root dist/ (vite default outDir).
         # Stage it into embedded/web/dist — the publish template's "files" entry
-        # — so the smoke-check, artifact upload, and npm publish all see the
-        # bundle. (embedded/web/dist is gitignored, hence the explicit copy.)
+        # — so the smoke-check and npm publish both see the bundle.
+        # (embedded/web/dist is gitignored, hence the explicit copy.)
         run: |
           pnpm run build:embedded
           rm -rf embedded/web/dist