Two fixes surfaced by run #55:
1. veza-stream-server (47 files): cargo fmt had been run locally but
never committed — the working tree was clean locally while HEAD
had unformatted code. CI's `cargo fmt -- --check` caught the drift.
This commit lands the formatting that was already staged.
2. ci.yml Install Go tools: `go install .../cmd/golangci-lint@latest`
resolves to v1.64.8 (the old /cmd/ module path). The repo's
.golangci.yml is v2-format, so v1 refuses with:
"you are using a configuration file for golangci-lint v2
with golangci-lint v1: please use golangci-lint v2"
Switch to the /v2/cmd/ path so @latest actually gets v2.x.
