Add Auggie provider adapter

## Goal Add Auggie / Augment Code as a Lineage provider target. ## Why Auggie is Augment Code's terminal-based coding agent with deep codebase context. It is relevant for users who want a provider with strong repository understanding and CLI-first interaction. ## Scope - Define the Auggie adapter boundary. - Detect or configure the `auggie` command where available. - Decide which package assets can map to Auggie config, context, MCP, or launch behavior. - Avoid packaging Augment/Auggie auth state or session tokens. - Add dry-run/inspect output showing what Auggie support will do. ## Acceptance Criteria - Auggie support is behind an explicit provider adapter. - No Augment/Auggie credentials or local login state are packaged. - Tests cover launch planning and materialization behavior that Lineage owns. - Docs explain required local Auggie setup and current limitations.