feat: load project-local MCP config files

[NicoAvanzDev]

Summary

• load project-local MCP definitions from the opened directory and parent project roots
• support .mcp.json plus common local editor/LLM MCP files like .cursor/mcp.json, .windsurf/mcp.json, .vscode/mcp.json, .claude/mcp.json, .codex/config.json, and .pi/mcp.json
• track project-local provenance so direct tool toggles write back to the originating config file

Testing

• npx vitest run __tests__/config.test.ts __tests__/direct-tools.test.ts

Notes

• full npm test still fails on the existing interactive visualizer dist-file checks unless that example is built first; this change does not touch that area

[NicoAvanzDev]

to me merged after #25