v4.2.0

Alex ACT Edition v4.2.0

Adds version-aware legacy installation support required before Alex ACT Plugin Mall 3.0.0 GA.

Changed

• Supports Mall 3 nested skills, agents, compatible commands, and MCP servers.
• Retains Mall 2 root-layout fallback during migration.
• Records exact installed component_paths for safe refresh and removal.
• Aligns Edition banners and product naming with the current Alex brand.

Upgrade requirement

Upgrade target template and legacy heirs to v4.2.0 and verify Mall installation behavior before Mall 3.0.0 GA. Unchanged Edition 3.x brains are not protected by this compatibility release.

Brain contract

No change: minimum Extension 9.5.1, manifest spec 1.4, .github brain subtree, marker schema v2.