docs: add README and CLAUDE.md with project overview and conventions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# Understand Anything
+
+## Project Overview
+An open-source tool combining LLM intelligence + static analysis to produce interactive dashboards for understanding codebases.
+
+## Architecture
+- **Monorepo** with pnpm workspaces
+- **packages/core** — Shared analysis engine (types, persistence, tree-sitter plugin, LLM prompt templates)
+- **packages/dashboard** — React + TypeScript web dashboard (React Flow, Monaco Editor, Zustand, TailwindCSS)
+- **packages/skill** — Claude Code skill (not yet implemented)
+
+## Key Commands
+- `pnpm install` — Install all dependencies
+- `pnpm --filter @understand-anything/core build` — Build the core package
+- `pnpm --filter @understand-anything/core test` — Run core tests
+- `pnpm dev:dashboard` — Start dashboard dev server
+
+## Conventions
+- TypeScript strict mode everywhere
+- Vitest for testing
+- ESM modules (`"type": "module"`)
+- Knowledge graph JSON lives in `.understand-anything/` directory of analyzed projects

README.md

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+# Understand Anything
+
+An open-source tool that combines LLM intelligence with static analysis to help anyone understand any codebase — from junior developers to product managers.
+
+## Features
+
+- **Knowledge Graph** — Automatically maps your codebase into an interactive graph of files, functions, classes, and their relationships
+- **Multi-Panel Dashboard** — Graph view, code viewer, chat, and learn panels in a workspace layout
+- **Natural Language Search** — Search your codebase with plain English: "which parts handle authentication?"
+- **Tree-sitter Analysis** — Accurate structural analysis for TypeScript, JavaScript (more languages coming)
+- **LLM-Powered Summaries** — Every node gets a plain-English description of what it does and why
+
+## Quick Start
+
+```bash
+# Install dependencies
+pnpm install
+
+# Build the core package
+pnpm --filter @understand-anything/core build
+
+# Start the dashboard dev server
+pnpm dev:dashboard
+```
+
+## Project Structure
+
+```
+packages/
+  core/        — Analysis engine: types, persistence, tree-sitter, LLM prompts
+  dashboard/   — React + TypeScript web dashboard
+  skill/       — Claude Code skill (coming soon)
+```
+
+## Tech Stack
+
+- TypeScript, pnpm workspaces
+- React 18, Vite, TailwindCSS
+- React Flow (graph visualization)
+- Monaco Editor (code viewer)
+- Zustand (state management)
+- tree-sitter (static analysis)
+
+## License
+
+MIT