[Epic] LOGAN v2 — modular, reusable, high-performance architecture

[ozgesolidkey]

Umbrella for the v2 refactor approved on 2026-06-25. North-star design: docs/ARCHITECTURE_V2.md.

Goal: turn LOGAN from a working-but-monolithic Electron app into a layered system whose editor/viewer core is reusable (logs today; code/diff/nexum + web later) — via safe, incremental, individually-shippable phases. No big-bang.

Layers: L0 Host port + Command Bus · L1 Document model · L2 Editor/Viewer core + Decoration API · L3 feature plugins · L4 workbench shell.

Phases:

• Phase 0 — Modularize the renderer #15 — Phase 0: Modularize the renderer (gating step)
• Phase 1 — Host port (abstract the platform) #16 — Phase 1: Host port
• Phase 2 — Editor/Viewer core + Decoration API #17 — Phase 2: Editor/Viewer core + Decoration API
• Phase 3 — Unify the Command Bus (UI + agent) #18 — Phase 3: Unify the Command Bus (UI + agent)
• Phase 4 — Document model #19 — Phase 4: Document model
• Phase 5 — Package the core as a reusable lib #20 — Phase 5: Package the core as a reusable lib

Work happens on branch refactor/v2-architecture. Each phase = its own PR, tests green.

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