Reload the chat session based on the open project

Features

• #84 — per-project session persistence (feat(plugin)): sessions stamped with the owning .kicad_pro (schema v2) and auto-restored on first panel display for the currently open project; a 1 s two-tick-confirmed poll follows project switches in place (the panel swaps session instead of lingering or stacking windows); also fixes the None/mcp URL error (LLMClient.set_base_url())

Fixes

• #76 — footprint Edge.Cuts geometry: expose footprint Edge.Cuts geometry through pcb-query
• #78 — streamed LLM responses over subprocess: the SSL-fallback path (KiCad's embedded Python lacks ssl) now relays SSE deltas chunk-by-chunk instead of degrading to a one-shot non-streaming call; non-streaming timeouts unified 60 s → 300 s
• #80 — reload KiCad on every turn exit: board reload was skipped when a tool call failed — failure paths now mark dirty paths and reach _auto_reload_modified_files
• #82 — router pads: routing to duplicate-named pads (edge-connector fingers sharing a net) and edge-mounted pads; single-layer A* now filters obstacles by routing layer

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新特性

• #84 — 会话按项目持久化：会话与所属 .kicad_pro 项目文件绑定（存储 schema v2），面板首次显示时自动恢复当前打开项目的会话；以 1 秒一次的轮询、连续两次确认跟随项目切换并原地切换会话（面板直接切换会话，而不是残留或堆叠窗口）；同时修复了 None/mcp URL 错误（LLMClient.set_base_url()）

问题修复

• #76 — 封装 Edge.Cuts 几何：通过 pcb-query 暴露封装内部的 Edge.Cuts 几何
• #78 — 子进程流式转发 LLM 响应：SSL 回退路径（KiCad 内置 Python 缺少 ssl 模块）现在逐块转发 SSE 增量，而不是降级为一次性非流式调用；非流式调用超时统一从 60 秒提高到 300 秒
• #80 — 每个回合结束时都重载 KiCad：此前工具调用失败时会跳过板子重载——现在失败路径也会标记脏路径并走到 _auto_reload_modified_files
• #82 — 布线修复：支持布线到同名焊盘（共用网络的边缘连接器金手指）和板边安装焊盘；单层 A* 现在按布线层过滤障碍物