Core 0.12.3 — reusable ingestion connections

Ingestion flows can select multiple physical tables through one connection. Each table source uses the connector-defined selector, while its ODCS contract selects columns. Top-level project package names can use exact installed short references; immutable locks retain full Git provenance. Existing stream-based projects remain supported. Node 22/24 CI and installed-package/editor checks passed. npm publication is a separate step.