PhantomCrypt: Composing Existence and Content Deniability with Post-Quantum Envelope

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Traditional deniable encryption denies the \emph{content} of secret communications by allowing plausible alternative plaintexts under coercion. But the recognizable use of a deniable-encryption tool can itself defeat the purpose: a revealed plaintext becomes suspicious once a coercer detects that a non-standard tool was used, and fully encrypted, format-anomalous traffic is already detected and acted upon by deployed censorship systems. This motivates a second axis of deniability, the deniabilit