chore(ci): remove raw binaries from build after packaging

Add a cleanup step in the release workflow to delete raw binary files for each platform,
retaining only the tar.gz archives, checksums.txt, and install script.

.gitea/workflows/release.yml

@@ -45,6 +45,13 @@ jobs:
           done
           sha256sum build/grokkit-*.tar.gz | tee build/checksums.txt
           cp scripts/grokkit-install.sh build/
+          # Clean up raw binaries (keep only tars, checksums, sh)
+          for plat in 'linux/amd64' 'linux/arm64' 'darwin/amd64' 'darwin/arm64' 'windows/amd64'; do
+            IFS='/' read -r OS ARCH <<< "$plat"
+            BIN="grokkit-${OS}-${ARCH}"
+            if [ "$OS" = "windows" ]; then BIN="${BIN}.exe"; fi
+            rm -f "build/${BIN}"
+          done
       - name: Install dependencies
         run: apt update && apt install -y jq
       - name: Create Release & Upload Assets