CRQR: A Relational–Continuation–Statistical Reconstruction of Finite-Dimensional Complex Quantum Theory

We present the final audited-closure formulation of CRQR, a principle-based reconstruction of finite-dimensional complex quantum theory from a pre-operational relational substrate. The reconstruction keeps structural possibility, physical test membership, quantitative statistical identity, classical control, topological closedness, finite-dimensionality, causal normalisation, and specifically quantum selection principles logically distinct. A possibility-only continuation quotient is shown to define only a structural proto-state; full operational states and transformations appear only after a Stable Statistical Experiment Sector and a regime-indexed all-context statistical quotient have been introduced. Stable Classical Control yields dyadic mixtures. A weak operational topology is then defined on actual deterministic preparation transformations, and Physical Operational Closedness requires operationally convergent physical preparations to have a physical preparation realising their limit. This yields full convexity and affine dynamics without adjoining nonphysical state points. Finite statistical separability gives a finite-dimensional affine representation and a canonical ordered real linearisation without assuming no-restriction or local faithfulness of process representations. The final bridge to the finite-dimensional causal operational theory used by Nakahira is rebuilt at the level of physical finite indexed tests. A single regime-indexed quotient is used throughout. Transformations are precisely quotient classes represented by outcomes of physical tests; deterministic and normalised states are distinguished and then proved equivalent; state-branch normalisability is formulated operationally; finite classical outcome processing is explicitly required to be statistically additive in every downstream context; and a Finite Sandwich Expansion theorem proves equivalence between CRQR complete-context equality and ancillary-sandwich equality. A canonical real-linear isomorphism between the CRQR state-space linearisation and Nakahira’s real state span supplies the missing finite-dimensionality/closedness match. These results yield an Exact Physical-OPT Extraction Theorem that verifies the required operational background before Local Equivalence or purification is invoked. Local Equivalence and Equivalent-System Purification, with one purifying system fixed for each system type, are introduced only afterwards. Conditional on Nakahira’s 2026 reconstruction theorem, the resulting sector is standard finite-dimensional complex quantum mechanics, with measurement no-restriction derived rather than assumed. A dependency audit makes explicit that physical operations precede their linear representations and that no Hilbert-space state, POVM, completely positive map, or complex tensor-product structure is inserted into the bridge.