docs: sync en/ with zh/ - add missing translations

- Add headless-cli skill (SKILL.md + references)
- Add Hard Constraints.md (强前置条件约束)
- Add Code Review.md (审查代码)
- Translated using Gemini CLI headless mode

i18n/en/skills/01-ai-tools/headless-cli/references/gemini-cli.md

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+Here's the English translation of the provided Markdown document:
+
+# Gemini CLI Parameter Reference
+
+> Source: [Official Documentation](https://geminicli.com/docs/get-started/configuration/)
+
+## Installation
+
+```bash
+npm install -g @anthropic-ai/gemini-cli
+```
+
+## Authentication
+
+The first run will guide you through Google account login, or you can set environment variables:
+```bash
+export GEMINI_API_KEY="YOUR_API_KEY"
+```
+
+## Core Command Line Parameters
+
+| Parameter | Description | Example |
+|:---|:---|:---|
+| `--model <model>` | Specify model | `--model gemini-2.5-flash` |
+| `--yolo` | YOLO mode, automatically approve all tool calls | `gemini --yolo` |
+| `--approval-mode <mode>` | Approval mode: `default`/`auto_edit`/`yolo` | `--approval-mode auto_edit` |
+| `--allowed-tools <tools>` | List of allowed tools (comma separated) | `--allowed-tools ''` (disable all) |
+| `--output-format <format>` | Output format: `text`/`json`/`stream-json` | `--output-format text` |
+| `--sandbox` / `-s` | Enable sandbox mode | `gemini -s` |
+| `--prompt <prompt>` / `-p` | Non-interactive mode, pass prompt directly | `gemini -p "query"` |
+| `--prompt-interactive <prompt>` / `-i` | Interactive mode with initial prompt | `gemini -i "explain"` |
+| `--debug` / `-d` | Enable debug mode | `gemini -d` |
+
+## Available Models
+
+- `gemini-2.5-flash` - Fast model
+- `gemini-2.5-pro` - Advanced model
+- `gemini-3-flash-preview` - Latest Flash
+- `gemini-3-pro-preview` - Latest Pro
+
+## Headless Mode Usage
+
+```bash
+# Basic headless call (piped input)
+cat input.txt | gemini -p "Your prompt" --output-format text
+
+# Disable tool calls (plain text output)
+cat input.txt | gemini -p "Your prompt" --output-format text --allowed-tools ''
+
+# YOLO mode (skip all confirmations)
+gemini --yolo "Your prompt"
+
+# Or use approval-mode
+gemini --approval-mode yolo "Your prompt"
+```
+
+## Configuration File
+
+Configuration is stored in `~/.gemini/settings.json` or project `.gemini/settings.json`:
+
+```json
+{
+  "security": {
+    "disableYoloMode": false
+  },
+  "model": {
+    "name": "gemini-2.5-flash"
+  }
+}
+```
+
+## Proxy Configuration
+
+```bash
+export http_proxy=http://127.0.0.1:9910
+export https_proxy=http://127.0.0.1:9910
+```
+
+## Frequently Asked Questions
+
+1.  **MCP initialization is slow**: Use `--allowed-tools ''` to skip.
+2.  **Timeout**: Use the `timeout` command wrapper.
+3.  **Output includes logs**: Redirect stderr `2>/dev/null`.