Add Gemini CLI integration skill

Implement gemini skill following codex pattern with Python wrapper supporting multiple execution modes (uv run, python3, direct), configurable models (gemini-2.5-pro/flash/1.5-pro), timeout control, and zero-dependency cross-platform compatibility.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

skills/gemini/SKILL.md

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+---
+name: gemini
+description: Execute Gemini CLI for AI-powered code analysis and generation. Use when you need to leverage Google's Gemini models for complex reasoning tasks.
+---
+
+# Gemini CLI Integration
+
+## Overview
+
+Execute Gemini CLI commands with support for multiple models and flexible prompt input. Integrates Google's Gemini AI models into Claude Code workflows.
+
+## When to Use
+
+- Complex reasoning tasks requiring advanced AI capabilities
+- Code generation and analysis with Gemini models
+- Tasks requiring Google's latest AI technology
+- Alternative perspective on code problems
+
+## Usage
+
+**推荐方式**（使用 uv run，自动管理 Python 环境）：
+```bash
+uv run ~/.claude/skills/gemini/scripts/gemini.py -m <model> -p "<prompt>" [working_dir]
+```
+
+**备选方式**（直接执行或使用 Python）：
+```bash
+~/.claude/skills/gemini/scripts/gemini.py -m <model> -p "<prompt>" [working_dir]
+# 或
+python3 ~/.claude/skills/gemini/scripts/gemini.py -m <model> -p "<prompt>" [working_dir]
+```
+
+## Timeout Control
+
+- **Built-in**: Script enforces 2-hour timeout by default
+- **Override**: Set `GEMINI_TIMEOUT` environment variable (in milliseconds)
+- **Bash tool**: Always set `timeout: 7200000` parameter for double protection
+
+### Parameters
+
+- `-m, --model` (optional): Model to use (default: gemini-2.5-pro)
+  - `gemini-2.5-pro`: Latest flagship model
+  - `gemini-2.5-flash`: Fast, efficient model
+  - `gemini-1.5-pro`: Previous generation
+- `-p, --prompt` (required): Task prompt or question
+- `working_dir` (optional): Working directory (default: current)
+
+### Return Format
+
+Plain text output from Gemini:
+
+```text
+Model response text here...
+```
+
+Error format (stderr):
+
+```text
+ERROR: Error message
+```
+
+### Invocation Pattern
+
+When calling via Bash tool, always include the timeout parameter:
+
+```yaml
+Bash tool parameters:
+- command: uv run ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "<prompt>"
+- timeout: 7200000
+- description: <brief description of the task>
+```
+
+Alternatives:
+
+```yaml
+# Direct execution (simplest)
+- command: ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "<prompt>"
+
+# Using python3
+- command: python3 ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "<prompt>"
+```
+
+### Examples
+
+**Basic query:**
+
+```bash
+# Recommended: via uv run
+uv run ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "explain quantum computing"
+# timeout: 7200000
+
+# Alternative: direct execution
+~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "explain quantum computing"
+```
+
+**Code analysis:**
+
+```bash
+uv run ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-flash -p "review this code for security issues: $(cat app.py)"
+# timeout: 7200000
+```
+
+**With specific working directory:**
+
+```bash
+uv run ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "analyze project structure" "/path/to/project"
+# timeout: 7200000
+```
+
+**Using fast model:**
+
+```bash
+uv run ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-flash -p "quick code suggestion"
+# timeout: 7200000
+```
+
+**Using python3 directly (alternative):**
+
+```bash
+python3 ~/.claude/skills/gemini/scripts/gemini.py -m gemini-2.5-pro -p "your prompt here"
+```
+
+## Notes
+
+- **Recommended**: Use `uv run` for automatic Python environment management (requires uv installed)
+- **Alternative**: Direct execution `./gemini.py` (uses system Python via shebang)
+- Python implementation using standard library (zero dependencies)
+- Cross-platform compatible (Windows/macOS/Linux)
+- PEP 723 compliant (inline script metadata)
+- Requires Gemini CLI installed and authenticated
+- Supports all Gemini model variants
+- Output is streamed directly from Gemini CLI