Update phases.md with Phase 3 checklist (in_progress), add session progress log entry, record claude CLI architecture decision in task_plan.md, update README/TODO/CHANGELOG with Phase 3 additions, and sync .claude/CLAUDE.md with current constraints.
Architecture decision: Tauri 2.x + Svelte 5 + Claude Agent SDK (Node.js sidecar). Includes research on Agent SDK streaming, xterm.js performance, WebKit2GTK limitations, and adversarial review corrections (two-tier observation, Svelte 5 over Solid.js, SDK abstraction layer). Six implementation phases defined, MVP = Phases 1-4.