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//! Format adapters.
//!
//! An adapter proposes a reconstruction hypothesis. It never overrides the
//! byte authority: a hypothesis is only admitted after it reproduces the exact
//! source bytes and wins the complete-cost court.
/// The source-format class decision for an input.
///
/// File extensions are hints, never authority. In Phase 1 every input is
/// preserved by the opaque adapter, which is the unconditional exact floor.