docs(setup): add beginner and advanced guides

Split the setup documentation into a simple beginner path and a separate advanced path. Add OS-specific quick starts for Windows and macOS/Linux so non-technical users can copy and paste the right commands without sorting through Bun and source-build instructions.

docs/non-technical-setup.md

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+# OpenClaude for Non-Technical Users
+
+This guide is for people who want the easiest setup path.
+
+You do not need to build from source. You do not need Bun. You do not need to understand the full codebase.
+
+If you can copy and paste commands into a terminal, you can set this up.
+
+## What OpenClaude Does
+
+OpenClaude lets you use an AI coding assistant with different model providers such as:
+
+- OpenAI
+- DeepSeek
+- Gemini
+- Ollama
+- Codex
+
+For most first-time users, OpenAI is the easiest option.
+
+## Before You Start
+
+You need:
+
+1. Node.js 20 or newer installed
+2. A terminal window
+3. An API key from your provider, unless you are using a local model like Ollama
+
+## Fastest Path
+
+1. Install OpenClaude with npm
+2. Set 3 environment variables
+3. Run `openclaude`
+
+## Choose Your Operating System
+
+- Windows: [Windows Quick Start](quick-start-windows.md)
+- macOS / Linux: [macOS / Linux Quick Start](quick-start-mac-linux.md)
+
+## Which Provider Should You Choose?
+
+### OpenAI
+
+Choose this if:
+
+- you want the easiest setup
+- you already have an OpenAI API key
+
+### Ollama
+
+Choose this if:
+
+- you want to run models locally
+- you do not want to depend on a cloud API for testing
+
+### Codex
+
+Choose this if:
+
+- you already use the Codex CLI
+- you already have Codex or ChatGPT auth configured
+
+## What Success Looks Like
+
+After you run `openclaude`, the CLI should start and wait for your prompt.
+
+At that point, you can ask it to:
+
+- explain code
+- edit files
+- run commands
+- review changes
+
+## Common Problems
+
+### `openclaude` command not found
+
+Cause:
+
+- npm installed the package, but your terminal has not refreshed yet
+
+Fix:
+
+1. Close the terminal
+2. Open a new terminal
+3. Run `openclaude` again
+
+### Invalid API key
+
+Cause:
+
+- the key is wrong, expired, or copied incorrectly
+
+Fix:
+
+1. Get a fresh key from your provider
+2. Paste it again carefully
+3. Re-run `openclaude`
+
+### Ollama not working
+
+Cause:
+
+- Ollama is not installed or not running
+
+Fix:
+
+1. Install Ollama from `https://ollama.com/download`
+2. Start Ollama
+3. Try again
+
+## Want More Control?
+
+If you want source builds, advanced provider profiles, diagnostics, or Bun-based workflows, use:
+
+- [Advanced Setup](advanced-setup.md)