Improve Yield 0.5.1 developer setup and mirror parity

[bigboateng]

Summary

• make copyable non-Git commands explicit and keep Rust scaffolds commit-ready
• add portable exact-version recovery to generated Go and Rust adapters
• mirror stable public release units to Artifact Registry and require a verified private receipt before finalization

Test Plan

• go test ./... && go build ./... && go vet ./...
• npm run test:release && npm run test:selfhost && npm run format:check
• TypeScript, Python, and Rust SDK tests
• non-Git TypeScript/Python, Rust lockfile, and clean-clone adapter recovery journeys