reqwest_get_string() was hand-rolling HTTP/1.1 over raw TCP despite reqwest
being an existing dependency. The hand-rolled implementation had two bugs:
1. URL path parsing: url.find('/') matched the first '/' in 'http://',
producing path '//127.0.0.1:9222/json/version' instead of '/json/version'
2. read_to_end() hangs: Chrome's DevTools HTTP server ignores Connection: close
and keeps the socket open, so read_to_end() waits for EOF that never comes
This caused 'agent-browser --cdp <port>' to always timeout when AGENT_BROWSER_NATIVE=1.
Fix: replace 49 lines of broken TCP code with reqwest::get(), which was
already in Cargo.toml.
Li Yang
de5ea1d8cf