Stop marking releases as pre-release by default

The 0.x-is-always-prerelease default didn't match what this project
actually wants — v0.1.3 was explicitly unmarked as pre-release right
after publishing. Every release is now just a normal release.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -107,10 +107,11 @@ jobs:
         run: |
           set -eu
           API="https://${GITEA_HOST}/api/v1/repos/${GITEA_REPO}"
-          case "${{ steps.version.outputs.value }}" in
-            0.*) prerelease=true ;;
-            *) prerelease=false ;;
-          esac
+          # Every release is a normal release, not a "pre-release" — the
+          # earlier 0.x-is-always-prerelease default didn't match what
+          # this project actually wants published (v0.1.3 was explicitly
+          # corrected off "pre-release" after the fact).
+          prerelease=false
 
           # Idempotent: if a release for this tag already exists (e.g. a
           # re-run after a transient failure), delete it first rather than