add eco CLI symlink to setup wizard, document all CLI commands

setup.sh now installs eco → ~/.local/bin/eco (symlink to cli.py).
README.md updated with full eco command reference.

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

setup.sh

@@ -850,6 +850,16 @@ EOF
 
     SERVICES_INSTALLED=true
 
+    # Install `eco` CLI command
+    local cli_target="$HOME/.local/bin/eco"
+    mkdir -p "$HOME/.local/bin"
+    if [[ -L "$cli_target" || -f "$cli_target" ]]; then
+        success "eco CLI already installed at ~/.local/bin/eco"
+    else
+        ln -s "$SCRIPT_DIR/cli.py" "$cli_target"
+        success "Installed eco CLI → ~/.local/bin/eco"
+    fi
+
     # Start now?
     echo ""
     ask_yn "Start services now?" "n"