chore(release): remove package size reports

- Drop the afterAllArtifactBuild size reporting hook and the previous-release baseline downloads in CI
- Stop uploading, checksumming, and publishing package-size-*.json
- Keep the afterPack package content audit, now without size tracking
- Update RELEASING.md and the verification docs, and add a changelog fragment

.github/workflows/package-release.yml

@@ -59,17 +59,6 @@ jobs:
           bun install --frozen-lockfile
           bun run build
 
-      - name: Download previous package size reports
-        shell: bash
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          mkdir -p .tmp/package-baseline
-          previous=$(gh api "repos/$GITHUB_REPOSITORY/releases" --jq '[.[] | select(.draft == false and .tag_name != env.GITHUB_REF_NAME)] | sort_by(.published_at) | last | .tag_name // empty')
-          if [ -n "$previous" ]; then
-            gh release download "$previous" --pattern 'package-size-*.json' --dir .tmp/package-baseline || echo 'Previous release has no package size reports; size comparison will be skipped.'
-          fi
-
       - name: Build AppImage
         run: bun run build:appimage
         env:
@@ -98,7 +87,6 @@ jobs:
             release/*.AppImage
             release/latest*.yml
             release/*.blockmap
-            release/package-size-*.json
           if-no-files-found: error
 
   build-macos:
@@ -159,17 +147,6 @@ jobs:
           bun install --frozen-lockfile
           bun run build
 
-      - name: Download previous package size reports
-        shell: bash
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          mkdir -p .tmp/package-baseline
-          previous=$(gh api "repos/$GITHUB_REPOSITORY/releases" --jq '[.[] | select(.draft == false and .tag_name != env.GITHUB_REF_NAME)] | sort_by(.published_at) | last | .tag_name // empty')
-          if [ -n "$previous" ]; then
-            gh release download "$previous" --pattern 'package-size-*.json' --dir .tmp/package-baseline || echo 'Previous release has no package size reports; size comparison will be skipped.'
-          fi
-
       - name: Build signed + notarized macOS artifacts
         run: bun run build:mac
         env:
@@ -193,7 +170,6 @@ jobs:
             release/*.zip
             release/latest*.yml
             release/*.blockmap
-            release/package-size-*.json
           if-no-files-found: error
 
   build-windows:
@@ -235,17 +211,6 @@ jobs:
           bun install --frozen-lockfile
           bun run build
 
-      - name: Download previous package size reports
-        shell: bash
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          mkdir -p .tmp/package-baseline
-          previous=$(gh api "repos/$GITHUB_REPOSITORY/releases" --jq '[.[] | select(.draft == false and .tag_name != env.GITHUB_REF_NAME)] | sort_by(.published_at) | last | .tag_name // empty')
-          if [ -n "$previous" ]; then
-            gh release download "$previous" --pattern 'package-size-*.json' --dir .tmp/package-baseline || echo 'Previous release has no package size reports; size comparison will be skipped.'
-          fi
-
       - name: Verify managed Windows launcher
         run: bun test src/main/runtime/managed-launcher.test.ts
 
@@ -270,5 +235,4 @@ jobs:
             release/*.zip
             release/latest*.yml
             release/*.blockmap
-            release/package-size-*.json
           if-no-files-found: error