fix: .env loading path and directory permissions

[LKCY33]

问题总结

问题 1：dotenv 加载路径错误

现象：dotenv 显示 \injecting env (0)\，环境变量没加载成功

原因：代码 \index.js\ 中硬编码了错误的 .env 加载路径，导致在某些工作目录下找不到 .env 文件

修复：修改为从当前目录加载

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问题 2：默认路径指向无权限目录

现象：\ENOENT: no such file or directory, open 'C:\Users\memory\evolution\...'\

原因：.env 没加载成功时，环境变量使用默认值，路径指向系统目录导致无权限写入

修复：添加必要的环境变量示例到 .env.example

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改动

文件	改动
\index.js\	dotenv 加载路径改为从当前目录 (./.env)
.env.example\	添加 \MEMORY_DIR\、\EVOLUTION_DIR\ 等环境变量示例

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Note

Low Risk
Small configuration-only change; main risk is unintended behavior change if deployments relied on the previous .env lookup path.

Overview
Fixes environment loading by changing index.js to load .env from the project’s own directory (./.env) instead of a hardcoded parent path, improving reliability across working directories.

Adds a new .env.example with default MEMORY_DIR/EVOLUTION_DIR/MEMORY_GRAPH_PATH (and related optional settings) so installations don’t fall back to unwritable system paths when env vars are missing.

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Example env uses CWD-relative paths with __dirname-based loading

Low Severity

The .env file is loaded using path.resolve(__dirname, './.env'), which always resolves relative to the module's install location. However, .env.example suggests relative paths like ./memory for MEMORY_DIR, EVOLUTION_DIR, and MEMORY_GRAPH_PATH, which resolve relative to the current working directory (CWD). If a user copies this template and runs the tool from a different directory (e.g., node /path/to/evolver/index.js), the .env will be found but its paths will resolve against the wrong directory — potentially recreating the exact "no such file or directory" problem this PR aims to fix.

Additional Locations (1)

• index.js#L4-L5