* refactor(config): centralize internode transport constants
* fix(bench): guard all ripgrep calls behind dry-run check
Move require_cmd rg and metrics collection inside the non-dry-run
path so that --dry-run works on hosts without rg installed.
* feat(tooling): cross-platform protoc setup for Linux and macOS
Make install-protoc.sh support Linux (x86_64, aarch64) alongside
macOS, and bump CI protoc from 29.3 to 33.1 to match the version
required by the gproto build script.
* fix(bench): record internode baseline error counts
* fix(skill): correct YAML frontmatter formatting for release-version-bump
* chore(ci): bump protoc version to 34.1
* fix(tooling): bump protoc 33.1 to 34.1 in install script, restore SKILL.md description
---------
Co-authored-by: Henry Guo <marshawcoco@users.noreply.github.com>
