feat(cli): colitur publish -- the static tree

Writes ef/<year>.{json,csv,xml,ics}, one JSON per day, the schema and a
generated index. That tree is the API: any web server or git repo serves
it, and nothing runs at request time.

Deterministic: publishing twice is byte-identical, asserted in cli.t.
That is what makes publishing into a git repo safe -- the diff shows
only real change, and you review it before pushing.

Non-destructive: a manifest records exactly the files this tool wrote,
so --prune can only remove files a previous run created. A file you put
in the output directory yourself is never touched, with or without
--prune. Asserted in both directions.

Pruning a stale file also removes any directory it leaves empty behind
it (e.g. an old year's own ef/<year>/ tree), stopping at --out itself --
without this, a pruned year's own directory would survive empty and
test -d would still see it.

schema/day-v1.json is resolved the same prefix-relative way data/ef's
own sexp files are (installed vs build-tree, probed rather than
assumed), never from cwd, and a missing schema fails with one line on
stderr before anything is written rather than emitting an empty file.
Needed schema/day-v1.json wired into the root dune file's default alias
and into test/dune's cram deps -- unlike data/ and templates/, nothing
made dune mirror schema/ into the build tree before this.

unix is added to bin/dune's libraries for mkdir_p; it ships with the
compiler, so colitur.opam and dune-project are unchanged.

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