- CLAUDE.md: add rule to never read images directly, only via Agent
- CLAUDE.md: add rule to never use chrome-devtools take_screenshot directly
- BUG_REPORT_CLAUDE_CODE_PNG_CRASH.md: full root cause analysis
- tools/patch_claude_code.js: v2 patcher with mapper media_type fix
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>