Implement Plan — Solo Session

Implement phases from: $ARGUMENTS

Parse arguments: first arg is the plan folder, second is the group name OR --audit.

Architecture (1M Context — Solo Builder)

Each Claude Code session implements one group with its own 1M context. No subagents — you read everything, implement everything, review everything yourself. The user coordinates parallelism by opening multiple terminals.

Terminal 1: /implement plans/260314-auth auth-system
Terminal 2: /implement plans/260314-auth dashboard-ui
Terminal 3: /implement plans/260314-auth --audit    ← after all groups done

Why Solo?

Subagents get 200K context, not 1M. By doing everything in one session, every phase implementation benefits from the full 1M window — you can hold the entire plan, all reference files, and accumulated implementation context simultaneously. The fat orchestrator doesn't delegate; it is the builder.