docs: record packaged runtime smoke result

[ArcueidMP]

Summary

• Record PR packaging: add runtime Windows unpacked build #22 / merge commit 9efbf1b
• Record Step 10.2 packaged Runtime smoke as passed
• Record Runtime unpacked output and exe path
• Record that external generated pet package load was skipped, not failed
• Update dev-log, packaging workflow notes, and release-readiness evidence

Scope

Docs-only.

This PR does not:

• package Maker
• bundle Python
• package the Python image pipeline
• create an installer
• create NSIS setup
• create a portable single exe
• publish artifacts
• create a GitHub Release binary
• create or modify tags
• create a release
• add auto-updater support
• add zip export
• add persistent settings
• add Runtime launch-from-Maker
• add rembg
• add cloud APIs
• add system tray
• add multi-pet support
• add plugin support
• add new animation features

Verification

• git diff --check
• Hidden control character scan
• corepack pnpm typecheck

Step 10.2 result

Packaged Runtime smoke passed on 2026-05-25.

Skipped, not failed:

• External generated pet package load