feat(bench): add speed-bench tool service for drafter benchmarks

Runs llama.cpp's SPEED-Bench client (pinned commit) against
llama-server over the compose network, in the tools profile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -22,7 +22,7 @@ It creates and syncs `.env`, generates secrets, downloads the models, and brings
 | [`docs/architecture.md`](docs/architecture.md) | Each service, why it exists, and why it's configured the way it is |
 | [`docs/gateway.md`](docs/gateway.md) | OmniRoute: dashboard, provider connections, API keys, timeouts, web search |
 | [`docs/network-access.md`](docs/network-access.md) | Who can reach which port, and why |
-| [`docs/operations.md`](docs/operations.md) | What `update.sh` does: env sync, secrets, downloads |
+| [`docs/operations.md`](docs/operations.md) | What `update.sh` does: env sync, secrets, downloads; speed bench |
 | [`docs/coding-cli-setup/`](docs/coding-cli-setup/index.md) | Pointing Claude Code, Kimi CLI, OpenCode and Qwen Code at the gateway |
 | [`docs/research/`](docs/research/README.md) | Dated research and decision records, each marked current or superseded |
 | [`docs/server-planing.md`](docs/server-planing.md) | Background research: a 4× GPU rack build. Not an active plan |