docs: restructure README, move detailed content to docs/ directory

docs/COMMANDS.md

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+# Slash Commands
+
+AnchorCli provides several slash commands for managing your session and interacting with the AI.
+
+## Available Commands
+
+| Command | Description |
+|---------|-------------|
+| `/setup` | Run interactive TUI to configure API key and model (also accessible via `anchor setup` subcommand) |
+| `/help` | Show available tools and commands |
+| `/exit` | Exit the application |
+| `/clear` | Clear the conversation history |
+| `/status` | Show session token usage and cost |
+| `/compact` | Manually trigger context compaction |
+| `/reset` | Clear session and reset token tracker |
+| `/load` | Load a previous session from disk |
+| `/save` | Save current session to disk |
+
+## Usage
+
+Type any command starting with `/` in the REPL to execute it:
+
+```
+> /status
+Session: 1,234 tokens used ($0.0015)
+```
+
+```
+> /help
+Available tools: read_file, grep_file, replace_lines, ...
+Available commands: /setup, /help, /exit, /clear, ...
+```
+
+---
+
+*Back to [README.md](../README.md)*