%
\label{cor:no-identity-decoherence}
The diagonal resonance pattern
(Definition~\ref{def:diagonal-resonance}, I.D89)
--- the three-component splice
of free contraction (L),
equality-as-congruence (E),
and primitive self-products (P) ---
cannot occur at the ontic level in $\tau$.
Its three prerequisites are individually blocked:
\begin{enumerate}[\normalfont(i)]
    \item (L) is blocked by $\KAxiom{5}$
          (Definition~\ref{def:diagonal-discipline}, I.D03).
    \item (E) is blocked by NF-Confluence
          (Lemma~\ref{lem:nf-confluence}, I.L02)
          and three-level equality
          (Definition~\ref{def:three-equality}, I.D15).
    \item (P) is blocked by the star-autonomous structure
          (Theorem~\ref{thm:k5-structural-exclusion}, I.T39).
\end{enumerate}
Therefore, identity slippage
(Definition~\ref{def:identity-slippage}, I.D90)
is zero, shadow identities
(Definition~\ref{def:shadow-identity}, I.D91)
do not arise,
and ontic identity coherence
is maintained at 100\% under every admissible construction.

Diagonal resonance (I.D89) requires
the simultaneous presence of (L), (E), and (P).
Theorem~\ref{thm:ontic-identity-invariance} (I.T46)
established that each component
is individually blocked by the coherence kernel:
(L) by K5, (E) by NF-Confluence, (P) by star-autonomy.
Since the resonance pattern cannot assemble
without all three components,
it cannot occur.
Without diagonal resonance,
identity slippage (I.D90) has no source,
shadow identities (I.D91) have no mechanism
of generation,
and the identity coherence of
Theorem~\ref{thm:ontic-identity-invariance}
is maintained without exception.