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backbone** of the Unified Rigidity Framework (URF).\n\nIt defines canonical forms, invariants, and certificate structure shared across URF modules, ensuring consistency and preventing duplication of foundational machinery.\n\n## Role\n- Acts as the invariant anchor and canonicalization layer for URF.\n- Provides shared abstractions used by multiple URF components.\n- Supports certificate composition and verification workflows.\n\n## What lives here\n- Canonicalization mechanisms (e.g. Spine Normal Form).\n- Invariant representations and shared structural maps.\n- Certificate schemas and verification utilities.\n\n## Dependencies\nConsumed by:\n- urf-core\n- chronos-entropydepth\n- chronos-urf-rr\n- urf-verifier\n\nThis repository does not depend on application-specific or domain-specific URF modules.\n\n## Status\nStable structural module.\nChanges occur only to preserve cross-repository consistency.\n\n## Further documentation\nDetailed specifications, scripts, and technical notes are 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