Now that the SDK dependency resolves from crates.io instead of a sibling checkout, a workflow here needs nothing special to build. Same three jobs as the SDK's own ci.yml: pinned-toolchain test, a build-only msrv job on the declared 1.88 floor, and an advisory stable job that reports red but stays out of required status checks. Verified locally: all four `test`-job commands pass with the pinned 1.99.1 toolchain, and a build+test against an actual rustc 1.88.0 toolchain confirms the msrv job will be green too. Resolves the "own CI" open question in GOALS.md into goal 6; adds the matching "Rust version and CI" section to CLAUDE.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>