removing support for interop with unison before 2.52.0

It's time for (meteorological) spring cleaning.

There has been very recently ocaml security advisories about the builtin
marshaling code -- used by the old protocol.  That's not a unison bug,
and everyone using ocaml should be updating to a fixed version.
  https://urldefense.com/v3/__https://seclists.org/oss-sec/2026/q1/231__;!!IBzWLUs!Ud_l9CHqCYEHsM8pDw0i7Xda2cBVGzrNN8lXiubRH91tVVX2lIvPfqnyWxP8nF6KrcRsSrqoC61IyU3V8A$ 

2.52.0 was released on March 11, 2022, which will shortly be 4 years
ago:
  https://urldefense.com/v3/__https://github.com/bcpierce00/unison/releases/tag/v2.52.0__;!!IBzWLUs!Ud_l9CHqCYEHsM8pDw0i7Xda2cBVGzrNN8lXiubRH91tVVX2lIvPfqnyWxP8nF6KrcRsSrqoC621r13H8g$ 

That brought a new wire protocol, and compat to use the old protocol
when interoperating with pre-2.52.0 unison (which needs compatible ocaml
versions).

Now, everyone should have updated, so I believe there is no usefulness
to having the compat code operational.  Thus, I am thinking of a new
unison release with it disabled.

Is anyone using the compat code?   If so, are there reasons other than
"I could update but I haven't" or "my distribution/packaging-system has
super old unison and I could update or switch distributions but I
haven't"?





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