Decide: RS-TEST-* and RS-DEC-* reserved doc families, use or un-reserve

RS-DOC Section 3 reserves RS-TEST-* (conformance test suites) and RS-DEC-* (decision records) and both are empty; the style guide even defines a Decision doc type nothing uses. Either seed each family with a first document (e.g. an RS-DEC recording the draft-visibility decision from the sidebar ticket) or un-reserve them so the register stops advertising families that do not exist.

Surfaced in the 2026-07-07 spec-layer review.

Start by reading RS-DOC Section 3, the style guide’s Decision doc type, and the register, then inspect the sidebar ticket about draft visibility. Done means choosing whether to seed RS-TEST-* and RS-DEC-* or un-reserve them, updating the relevant documentation and register so the advertised families match what exists.

Written by the indexing model from the issue text.