fix(ci): restore releaseBody so latest.json notes is populated

[RealZST]

Summary

The release workflow refactor in 50df230 ("ci: parallelize Linux/Windows builds") split the single release job into create-release + release-desktop. In the process, the releaseBody input on tauri-apps/tauri-action@v0 was removed alongside the (now-unused) tagName / releaseName / releaseDraft inputs.

releaseBody is what tauri-action passes through to the Tauri bundler to fill the notes field of latest.json. Without it, every release from v1.2.0 onward has shipped a latest.json with "notes": "", so the desktop in-app update dialog has been silently falling back to the placeholder "Bug fixes and improvements." string instead of showing the actual changelog.

$ for v in v1.0.3 v1.1.0 v1.2.0 v1.2.1; do
    curl -fsSL "https://github.com/RealZST/HarnessKit/releases/download/$v/latest.json" \
      | python3 -c 'import json,sys;n=json.load(sys.stdin)["notes"];print(repr(n[:60]))'
  done
'## What\'s Changed\n* fix: sanitize MCP names for Codex...'  # v1.0.3 — fine
'## What\'s Changed\n* ci: add PR checks and CodeQL secur...'  # v1.1.0 — fine
''                                                              # v1.2.0 — broken
''                                                              # v1.2.1 — broken

(v1.3.0 was patched manually post-build — see release notes.)

The fix

Wire needs.create-release.outputs.changelog (which create-release already produces) into tauri-action:

        with:
          releaseId: ${{ needs.create-release.outputs.release_id }}
+         releaseBody: ${{ needs.create-release.outputs.changelog }}
          tauriScript: cargo tauri

Test plan

• Next release (v1.3.1+) builds via this workflow
• After that release publishes, latest.json's notes field is non-empty
• Desktop in-app update dialog displays the real changelog instead of the fallback string

🤖 Generated with Claude Code