First-draft release notes for 18.4.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 122adefc94a4dc4e97b4fd5c3328e7dc5b58ebd0
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2026-05-08T18:13:13Z
Releases: 18.4
First-draft release notes for 18.4.

As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.

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doc/src/sgml/release-18.sgml modified +1360 −0

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