fix(web): keep selected code blocks plain - #7973

💭 This diff touches markdown clipboard serialization, not Effect service code — the changed files are markdown-clipboard.ts and its test, with no Effect usage involved. There's a DOM mutation removing empty pre elements, but that's a behavior detail unrelated to Effect service conventions, so I don't have findings here; let me just double-check the file for any Effect usage to be safe.

1. git_tools — effect

2. browse_code — apps/web/src/markdown-clipboard.ts

💭 No effect code found, so this check passes cleanly. There's a slight conflict between the instruction to output plain text "All clear" and the requirement for JSON schema output, so I'll keep the JSON minimal with a success state and "All clear" summary since no findings means the default-failure check should succeed.