Simplify the versioned docs and make the Go SDK reference easier to scan. Add tables for SDK error categories and server codes, group REST error details under Error responses, and format Go examples with tabs. Add the Go version warning and pkg.go.dev reference, stronger callout colors, and backgrounds for inline and fenced code.
Validation:
- Astro checks and the docs build pass.
- Docs tests pass for all 17 pages, including internal links, version navigation, snapshots, and Go import metadata. The v0.2.0 snapshot check accepts the retained plain-text error wording.
Known follow-up: the SDK example still expects caller-provided username and password variables, and the pkg.go.dev page returned 404 during review pending SDK publication/indexing.