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Per-impl migration of MkvStream / M2tsStream / NetworkStream / NullStream / StdioStream from the deprecated pes::Stream trait to the typed pes::FrameSink trait. Both impls coexist during the 0.18 deprecation window — the existing Stream impls are unchanged. The FrameSink::finish signature differs (Box<Self> vs &mut self), which is why this couldn't be a blanket impl. Each migration re-borrows the box and delegates to the underlying Stream::finish body. FrameSink: Send forced two struct fields (M2tsStream's boxed Write/Read, MkvStream's boxed WriteSeek/Read) to gain `+ Send` bounds — minimum surface needed to make the Send-bounded trait impl-able. mux::resolve::output's local Box<dyn WriteSeek> construction picks up the same `+ Send`. tests/streams.rs's shared `stream.write/.finish/.info/.read` calls were disambiguated to `PesStream::*` to resolve the now-multiple candidates from coexisting trait impls. Caller migration (mux::resolve::output return type, autorip, CLI) is a later slice. This commit only adds new impls; nothing removed. See (internal)/memory/0_18_redesign.md. Single contributor: MattJackson.