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## Summary `buzz-agent` builds its LLM `reqwest::Client` without a User-Agent, and reqwest sends none by default, so OpenAI-compatible providers that identify clients by product token see buzz-agent as an anonymous caller. This sets `User-Agent: buzz-agent/<crate version>` on the shared LLM client in `crates/buzz-agent/src/llm.rs`. The version is `CARGO_PKG_VERSION`, the same value `agentInfo` reports over ACP. No request body or endpoint changes. Open point: the crate version is the workspace version (`0.1.0`), so every build reports the same version. A per-build version would need the desktop to pass one through at spawn time; this PR does not do that. ### Related issue None found. ### Testing - The test stub now captures the `User-Agent` request header; new `llm_requests_carry_buzz_agent_user_agent` asserts `buzz-agent/<version>` on a Chat Completions POST. - Verified red without the `.user_agent(...)` line (`left: None`), green with it. - `cargo test -p buzz-agent --lib llm::tests`: 194 passed. `cargo fmt` clean; the one clippy warning is pre-existing (`hints.rs:33`). - Not exercised in a built desktop app. Signed-off-by: Tom Bedor <tbedor@squareup.com> Co-authored-by: Tom Bedor <tbedor@squareup.com>