feat: add uninstaller scripts for all tools + restore yolo mode

Uninstallers (.sh + .ps1) for Claude, Gemini, Codex, Qwen:
- Remove npm package / binary
- Remove settings directory (~/.gemini, ~/.qwen, ~/.codex, ~/.claude)
- Remove env vars from bashrc/zshrc, /etc/environment, /etc/profile.d
- Remove npm registry config

Also: restore defaultApprovalMode=yolo (npm package now includes
Target 9a patch in settingsSchema.js)

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

codex/ucodex_uninstall.ps1

@@ -0,0 +1,60 @@
+# Codex CLI — Windows Uninstaller
+# Usage: powershell -ExecutionPolicy Bypass -File codex\ucodex_uninstall.ps1
+
+$ErrorActionPreference = "Continue"
+
+Write-Host ""
+Write-Host "  +--------------------------------------+" -ForegroundColor Cyan
+Write-Host "  |   Codex CLI -- Windows Uninstaller   |" -ForegroundColor Cyan
+Write-Host "  +--------------------------------------+" -ForegroundColor Cyan
+Write-Host ""
+
+# ---- Remove binary ----
+
+$installDir = "$env:LOCALAPPDATA\Programs\codex"
+if (Test-Path "$installDir\codex.exe") {
+    Write-Host "  Stopping codex processes..." -ForegroundColor Cyan
+    Get-Process -Name "codex" -ErrorAction SilentlyContinue | Stop-Process -Force
+    Write-Host "  Removing $installDir..." -ForegroundColor Cyan
+    Remove-Item -Recurse -Force $installDir
+    Write-Host "  Binary removed" -ForegroundColor Green
+
+    # Remove from PATH
+    $userPath = [System.Environment]::GetEnvironmentVariable("Path", "User")
+    if ($userPath -like "*$installDir*") {
+        $newPath = ($userPath -split ";" | Where-Object { $_ -ne $installDir }) -join ";"
+        [System.Environment]::SetEnvironmentVariable("Path", $newPath, "User")
+        Write-Host "  Removed from PATH" -ForegroundColor Green
+    }
+} else {
+    Write-Host "  Codex binary not found at $installDir" -ForegroundColor Yellow
+    # Check other common locations
+    $altPath = (Get-Command codex -ErrorAction SilentlyContinue).Source
+    if ($altPath) {
+        Write-Host "  Found at: $altPath — remove manually" -ForegroundColor Yellow
+    }
+}
+
+# ---- Remove config ----
+
+$codexDir = "$env:USERPROFILE\.codex"
+if (Test-Path $codexDir) {
+    Write-Host "  Removing $codexDir..." -ForegroundColor Cyan
+    Remove-Item -Recurse -Force $codexDir
+    Write-Host "  Config removed" -ForegroundColor Green
+} else {
+    Write-Host "  No config directory found" -ForegroundColor Yellow
+}
+
+# ---- Remove env vars ----
+
+Write-Host "  Removing environment variables..." -ForegroundColor Cyan
+[System.Environment]::SetEnvironmentVariable("OPENAI_API_KEY", $null, "User")
+[System.Environment]::SetEnvironmentVariable("OPENAI_BASE_URL", $null, "User")
+Remove-Item Env:OPENAI_API_KEY -ErrorAction SilentlyContinue
+Remove-Item Env:OPENAI_BASE_URL -ErrorAction SilentlyContinue
+Write-Host "  Env vars removed" -ForegroundColor Green
+
+Write-Host ""
+Write-Host "  Codex CLI fully uninstalled!" -ForegroundColor Green
+Write-Host ""

codex/ucodex_uninstall.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+# Codex CLI — Uninstaller
+# Removes Codex CLI binary, config, env vars.
+#
+# Usage: sudo bash ucodex_uninstall.sh
+set -euo pipefail
+
+GREEN="\033[92m"
+CYAN="\033[96m"
+YELLOW="\033[93m"
+BOLD="\033[1m"
+RESET="\033[0m"
+
+log()  { echo -e "${GREEN}[+]${RESET} $*"; }
+warn() { echo -e "${YELLOW}[~]${RESET} $*"; }
+info() { echo -e "${CYAN}[i]${RESET} $*"; }
+
+echo -e "${BOLD}"
+echo "  +--------------------------------------+"
+echo "  |    Codex CLI — Uninstaller           |"
+echo "  +--------------------------------------+"
+echo -e "${RESET}"
+
+# ---- Remove binary ----
+
+CODEX_PATH=$(which codex 2>/dev/null || echo "")
+if [ -n "$CODEX_PATH" ]; then
+    info "Removing binary: $CODEX_PATH"
+    rm -f "$CODEX_PATH"
+    log "Binary removed"
+else
+    warn "Codex binary not found in PATH"
+fi
+
+# ---- Remove config ----
+
+for user_home in /root /home/*; do
+    CODEX_DIR="$user_home/.codex"
+    if [ -d "$CODEX_DIR" ]; then
+        info "Removing $CODEX_DIR..."
+        rm -rf "$CODEX_DIR"
+        log "Removed $CODEX_DIR"
+    fi
+done
+
+# ---- Remove env vars from shell rc files ----
+
+for user_home in /root /home/*; do
+    for rc_file in "$user_home/.bashrc" "$user_home/.zshrc"; do
+        if [ -f "$rc_file" ] && grep -q 'OPENAI_API_KEY\|OPENAI_BASE_URL\|Codex' "$rc_file" 2>/dev/null; then
+            info "Cleaning env vars from $rc_file..."
+            sed -i '/# Codex/d' "$rc_file"
+            sed -i '/# UnlimitedCoding.*[Cc]odex/d' "$rc_file"
+            sed -i '/OPENAI_API_KEY/d' "$rc_file"
+            sed -i '/OPENAI_BASE_URL/d' "$rc_file"
+            log "Cleaned $rc_file"
+        fi
+    done
+done
+
+# ---- Remove env vars from /etc/environment ----
+
+if [ -f "/etc/environment" ] && grep -q 'OPENAI_API_KEY\|OPENAI_BASE_URL' /etc/environment 2>/dev/null; then
+    info "Cleaning /etc/environment..."
+    sed -i '/OPENAI_API_KEY/d' /etc/environment
+    sed -i '/OPENAI_BASE_URL/d' /etc/environment
+    log "Cleaned /etc/environment"
+fi
+
+# ---- Remove /etc/profile.d script ----
+
+if [ -f "/etc/profile.d/codex-cli.sh" ]; then
+    rm -f "/etc/profile.d/codex-cli.sh"
+    log "Removed /etc/profile.d/codex-cli.sh"
+fi
+
+echo ""
+echo -e "${GREEN}${BOLD}  Codex CLI fully uninstalled!${RESET}"
+echo ""