Architecture decisions

Architecture Decision Records (ADRs) document decisions already embodied in the codebase. They are not speculative design notes.

ADR	Title
ADR-0001	Package architecture and public API boundary
ADR-0002	Stable validation rule codes
ADR-0003	Severity, status and strict-mode semantics
ADR-0004	Independent package and schema versioning
ADR-0005	Exact alias resolution and deterministic precedence
ADR-0006	Profile-level detection and explicit override
ADR-0007	Truthful metadata and no silent fabrication
ADR-0008	Bounded sampling for large and backed matrices