Adopt framework v0.6.0 and call the shared script from the publish workflow

- framework moves from v0.5.2 to v0.6.0 (QC-YML-001, QC-WF-001, the YAML
  convention, the qc/artifacts and qc/code folders, autonomous mode, the CI
  publish script).
- .gitea/workflows/sync-milestones.yml: the two run blocks of six lines call
  framework/scripts/ci-publish-milestones.sh (ensure-tools, publish); QC-WF-001
  criterion 20. Same behaviour.
- CHANGELOG.md, Unreleased, Changed.

Tests 305 passed; changelog check passes; the wiki build writes 0 pages.

.gitea/workflows/sync-milestones.yml

@@ -68,23 +68,11 @@ jobs:
           git submodule update --init --recursive --depth=1
 
       - name: Make sure curl and jq are available
-        run: |
-          set -euo pipefail
-          if command -v curl >/dev/null && command -v jq >/dev/null; then exit 0; fi
-          sudo_cmd=""
-          if [ "$(id -u)" -ne 0 ]; then sudo_cmd="sudo"; fi
-          $sudo_cmd apt-get update -qq
-          $sudo_cmd apt-get install -y -qq curl jq
+        run: bash framework/scripts/ci-publish-milestones.sh ensure-tools
 
       - name: Publish accepted milestones
         env:
           GITEA_TOKEN: ${{ secrets.TOKEN_FOR_GITEA }}
           # Empty on a push (a real run); "true" or "false" on a manual run.
           DRY_RUN: ${{ inputs.dry_run }}
-        run: |
-          set -euo pipefail
-          if [ "$DRY_RUN" = "true" ]; then
-            bash framework/scripts/sync-project.sh --accepted-only
-          else
-            bash framework/scripts/sync-project.sh --accepted-only --apply
-          fi
+        run: bash framework/scripts/ci-publish-milestones.sh publish