Release v0.18.0

Summary

Replace prose-derived provenance with typed identities and separate semantic equality from source-file realization so the future realization report can be deterministic and loss preserving.

Added

• Canonical producer-scoped fact links on generation diagnostics, with fail-closed admission validation. (#24)
• Ordered Files and ImplementationFiles collections retaining every realization of one semantic artifact or validation rule. (#24)

Changed

• Diagnostic disposition now follows typed fact links instead of parsing human-readable messages. (#24)
• Definitions differing only by source or implementation file now resolve as one semantic variant while preserving a canonical compatibility file. (#24)