0.23.2 — the first verified tag

The first tag in this repository whose green is a fact rather than an assumption.

CI had been red for eleven consecutive releases — every tag from 0.13.0 to 0.23.1 —
while the local gate was green throughout. This release carries no behavioural change; it
exists so there is one commit whose CI status was checked before a release was attached to it.

Fixed

• CI is green again. It had been red for eleven consecutive releases — every tag from
  0.13.0 to 0.23.1 — with a locally green gate the whole time.

  Two independent causes, and both were in the two jobs task check did not run:

  job	cause
  MSRV 1.85	idna_adapter@1.2.2 pulled in icu_*@2.3.0, which need rustc 1.88
  Website	a markdown link from website/docs/ into the repository tree, which Docusaurus resolves at build time

  The MSRV break came in through the lockfile, with no commit of ours touching a line of Rust —
  a transitive dependency raised its rust-version and the declared 1.85 stopped holding.
  idna_adapter is pinned to 1.1.0, which uses unicode-normalization instead of icu and drops
  eight crates from the tree. The alternative was raising the MSRV, which would have quietly broken
  the promise README.md:164 makes to anybody building this.

Changed

• task check now runs msrv and website. Its own description said "everything CI runs"
  while those two were missing, which is how a red CI survived eleven releases behind a green local
  gate. A gate that covers less than the gate it claims to be is worse than one that admits its
  scope.