Updated MAC Canvas and MAC Clover docs

Property	Value
description	Tightened MAC Canvas and MAC Clover product roles in the published docs.
version	0.65.0
type	Update
related	MAC Canvas, MAC Clover

• Updated MAC Canvas as the planned company-standard canvas repo and workspace product.
• Updated MAC Clover as the planned company-standard AI agent product.
• Clarified adjacent boundaries with MAC Codex, MAC MCP, and shared governance.