2.0.1: AI Code Chat + Explorer overhaul

2.0.0 — AI Code Chat + Explorer overhaul (36 commits)
AI Chat
Copilot-style panel: local-LLM ReAct agent (search/neighbors/code/blast), lookup trace with clickable chips, Show on graph
Ancestor walk-up, Explorer scope, fuzzy project match, cross-turn memory
Provider management: Ollama + OpenAI-compatible presets, auto-fill, file-persisted keys
Markdown answers, copy buttons, en-US/zh-TW prompts, draggable/resizable panel
Explorer & 3D
Tree decoupled from LOD (always full), nested symbols, legend colors
Walk-up locate, focus pill + full-chain lighting, file labels, WASD flight, dblclick refit, help dialog, settle re-aim
Packaging
Bundled CLI resolver covers packaged app.asar.unpacked layout
Version 2.0.0 everywhere, emoji-free README with new feature section