ci(release): replace release.sh prepare hook with explicit named workflow steps

The build-dist and kit-version-update responsibilities previously hidden
inside scripts/release.sh (called via semantic-release's prepareCmd hook)
are now two named, visible steps in the staging-step-1.yml release job:

  1. 'Build distribution bundle'  — npm run build + git add dist -f + commit
  2. 'Update kit versions to X.Y.Z' — npm pkg set version for every kit in
     kits/matrix.json + commit kits/**/package.json

Both steps run only on a real release (dryRun == 'false') and execute after
the existing dry-run step captures the next version, so the version is
available via steps.get-version.outputs.version.

release.config.js is updated in lockstep:
  - prepareCmd removed from @semantic-release/exec (only publishCmd remains)
  - kits/**/package.json removed from @semantic-release/git assets (those
    package.jsons are now committed by the explicit workflow step before
    semantic-release runs, so they are already clean when the git plugin
    stages its assets)

The end-to-end ordering is unchanged: the two prep commits land on the
local staging branch before npx semantic-release runs; @semantic-release/git
pushes all local commits to staging; release-kits (which needs: release)
then checks out the updated staging branch and publishes each kit at the
correct version.

Refs #1210

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nickolas-dimitrakas

.github/workflows/staging-step-1.yml

@@ -366,6 +366,24 @@ jobs:
                   fi
                   echo "version=$NEXT_VERSION" >> "$GITHUB_OUTPUT"
 
+            - name: Build distribution bundle
+              if: ${{ github.event.inputs.dryRun == 'false' }}
+              run: |
+                  npm run build
+                  git add dist -f
+                  git commit -m 'chore(build): Generate latest bundle [skip ci]'
+
+            - name: Update kit versions to ${{ steps.get-version.outputs.version }}
+              if: ${{ github.event.inputs.dryRun == 'false' }}
+              run: |
+                  VERSION=${{ steps.get-version.outputs.version }}
+                  jq -r '.[].local_path' kits/matrix.json | while read KIT_PATH; do
+                      npm pkg set version="$VERSION" --prefix "$KIT_PATH"
+                      echo "Updated $KIT_PATH/package.json to $VERSION"
+                  done
+                  git add kits/
+                  git commit -m "chore(release): Update kit versions to $VERSION [skip ci]"
+
             - name: Release
               if: ${{ github.event.inputs.dryRun == 'false' }}
               run: |

release.config.js

@@ -42,7 +42,6 @@ module.exports = {
         [
             '@semantic-release/exec',
             {
-                prepareCmd: 'sh ./scripts/release.sh ${nextRelease.version}',
                 publishCmd: 'npm publish',
             },
         ],
@@ -65,7 +64,6 @@ module.exports = {
                     'package.json',
                     'package-lock.json',
                     'CHANGELOG.md',
-                    'kits/**/package.json',
                 ],
                 message:
                     'chore(release): ${nextRelease.version} [skip ci]\n\n${nextRelease.notes}',