Add uta (unleashtheagents/uta) to third-party CLI agent detection #16688

uta is an open-source (MIT) CLI agent orchestrator — brew install unleashtheagents/tap/uta — that plans with one model and fans work out to parallel workers (NVIDIA Nemotron on Nebius Token Factory, plus claude/agy/gemini CLIs). Detection is easy: it's a single static Go binary whose process name is always uta on macOS/Linux/Windows (no node wrapper, so comm/argv[0] matching works everywhere, unlike #9870). Icon assets: https://unleashtheagents.ai/icon-512.png and https://unleashtheagents.ai/favicon.svg; happy to provide any size/format. Repo: https://github.com/unleashtheagents/uta — would love uta sessions to get the same branded tab treatment as claude/agy.