Feature request: option to skip startup welcome/splash screen

Summary

Add a setting or environment variable to skip the startup welcome splash screen (the \"Welcome back [name]\" screen with Claude ASCII art, tips, and what's new).

Current behavior

Every session starts with a full-screen welcome splash that includes:

• \"Welcome back [name]\" heading with Claude ASCII art
• \"Tips for getting started\" section
• \"What's new\" section

There is no way to disable this.

Desired behavior

A setting in ~/.claude/settings.json (e.g. skipWelcomeScreen: true) or an environment variable (e.g. CLAUDE_CODE_DISABLE_WELCOME_SCREEN=1) that skips the splash and goes straight to the prompt.

Investigation

• Checked claude --help — no relevant flag
• Checked strings $(which claude) for env vars — no SPLASH, WELCOME, or ONBOARD env vars found
• Existing CLAUDE_CODE_DISABLE_* env vars do not cover this case

Use case

Power users who open Claude Code frequently find the splash screen adds friction. Once you're familiar with the tool, the tips and what's new content is not needed on every startup.