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Step 2 of the 9P chain (docs/9p.typ 12.2, docs/registry.typ 9P-2).
`drain` and `step` never asked a `*fuse.Fs` for anything but `retry()`,
`next()` and `reply()`, so the concrete pointer was a coupling that bought
nothing and forbade a second answer. `Transport` names the three; `Fs.transport()`
is the first implementor and the thunks are the entire cost.
No behaviour change. The order contract -- retry() to null, then next() to null --
moves into `drain`'s doc comment, where it belongs: it is the caller's rule and
every implementor inherits it, rather than a fact about FUSE.
`start` and `wake` keep their `*fuse.Fs`: they are about a MOUNT, which is a
FUSE thing, and a 9P listener will bring its own.
Measured unchanged against zig build fs-bench -Doptimize=ReleaseFast: getattr 19 ns,
lookup 40, read body 4K/1M 25/25, read ctl 385, read index 633, readdir 38,
read event (empty) 22, all at zero allocations.
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