[kvlonge]

Why

Model-layer rules treated marts as a dependency rank and could encourage semantic layer promotion. The fixture formatter also emitted canonical empty relations that SQBRSQL021 rejected.

Changes

• enforce one authoritative layer in model and reference identities
• add model-local schema, canonical folder, and logical schema alignment rules
• redefine SQBRGRAPH101 around internal layers while treating marts as published interfaces
• add exact consumer/dependency exceptions with stale-entry detection
• preserve model-header and path-default schema provenance through compilation
• exempt only canonical empty input fixtures from SQBRSQL021
• document layer semantics and add native and compiler-level regressions

Verification

• cargo test -p sqlbuild-rules-native
• focused formatter/rules integration tests with xdist
• focused Dagster integration unit tests with xdist
• dense compile fixture regression
• make check-ci
• public repository hygiene scan