Add gemini-web skill

skills/gemini-web/SKILL.md

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+---
+name: gemini-web
+description: Interacts with Gemini Web to generate text and images. Use when the user needs AI-generated content via Gemini, including text responses and image generation.
+---
+
+# Gemini Web Client
+
+## Quick start
+
+```bash
+npx -y bun scripts/main.ts "Hello, Gemini"
+npx -y bun scripts/main.ts --prompt "Explain quantum computing"
+npx -y bun scripts/main.ts --prompt "A cute cat" --image cat.png
+```
+
+## Commands
+
+### Text generation
+
+```bash
+# Simple prompt (positional)
+npx -y bun scripts/main.ts "Your prompt here"
+
+# Explicit prompt flag
+npx -y bun scripts/main.ts --prompt "Your prompt here"
+npx -y bun scripts/main.ts -p "Your prompt here"
+
+# With model selection
+npx -y bun scripts/main.ts -p "Hello" -m gemini-2.5-pro
+
+# Pipe from stdin
+echo "Summarize this" | npx -y bun scripts/main.ts
+```
+
+### Image generation
+
+```bash
+# Generate image with default path (./generated.png)
+npx -y bun scripts/main.ts --prompt "A sunset over mountains" --image
+
+# Generate image with custom path
+npx -y bun scripts/main.ts --prompt "A cute robot" --image robot.png
+
+# Shorthand
+npx -y bun scripts/main.ts "A dragon" --image=dragon.png
+```
+
+### Output formats
+
+```bash
+# Plain text (default)
+npx -y bun scripts/main.ts "Hello"
+
+# JSON output
+npx -y bun scripts/main.ts "Hello" --json
+```
+
+## Options
+
+| Option | Short | Description |
+|--------|-------|-------------|
+| `--prompt <text>` | `-p` | Prompt text |
+| `--model <id>` | `-m` | Model: gemini-3-pro (default), gemini-2.5-pro, gemini-2.5-flash |
+| `--image [path]` | | Generate image, save to path (default: generated.png) |
+| `--json` | | Output as JSON |
+| `--login` | | Refresh cookies only, then exit |
+| `--cookie-path <path>` | | Custom cookie file path |
+| `--profile-dir <path>` | | Chrome profile directory |
+| `--help` | `-h` | Show help |
+
+## Models
+
+- `gemini-3-pro` - Default, latest model
+- `gemini-2.5-pro` - Previous generation pro
+- `gemini-2.5-flash` - Fast, lightweight
+
+## Authentication
+
+First run opens Chrome to authenticate with Google. Cookies are cached for subsequent runs.
+
+```bash
+# Force cookie refresh
+npx -y bun scripts/main.ts --login
+```
+
+## Environment variables
+
+| Variable | Description |
+|----------|-------------|
+| `GEMINI_WEB_DATA_DIR` | Data directory |
+| `GEMINI_WEB_COOKIE_PATH` | Cookie file path |
+| `GEMINI_WEB_CHROME_PROFILE_DIR` | Chrome profile directory |
+| `GEMINI_WEB_CHROME_PATH` | Chrome executable path |
+
+## Examples
+
+### Generate text response
+```bash
+npx -y bun scripts/main.ts "What is the capital of France?"
+```
+
+### Generate image
+```bash
+npx -y bun scripts/main.ts "A photorealistic image of a golden retriever puppy" --image puppy.png
+```
+
+### Get JSON output for parsing
+```bash
+npx -y bun scripts/main.ts "Hello" --json | jq '.text'
+```