Architecture decision records

Architecture decision records (ADRs) capture cross-repository contracts that must be agreed before package implementations proceed. They are coordination records, not a runtime dependency: ecosystem packages own and test their respective APIs.

An ADR's pull request is its review forum. Merging that pull request records acceptance; superseding a decision requires a later ADR that links back to the earlier one.

ADR	Decision
0001	HSSM multi-response domains and versioned package observation results