chore: prepare v0.23.0 release (#577)

Cut the v0.22.0 binary bug fixes (#521-#572) as v0.23.0: mark the CHANGELOG
Unreleased section as v0.23.0 with its compare link and date, and refresh the
README "sqly v0.22.0" version strings to v0.23.0.

Author: nao1215

CHANGELOG.md

@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## [Unreleased]
+## [v0.23.0](https://github.com/nao1215/sqly/compare/v0.22.0...v0.23.0) (2026-06-02)
 
 ### Bug Fixes
 * Literal Dotted Object Names With A Schema Prefix: `.schema`, `.describe`, `.header`, and `.dump` now reach a table or view whose quoted literal name begins with `main.` or `temp.` (for example `CREATE TABLE "main.x"` or `CREATE VIEW "temp.v"`). Because the shell strips the quotes the user typed, a name is read as a schema qualifier only when no object literally carries it. `.tables` prints such a name quoted so it pastes back into these commands.

README.md

@@ -112,7 +112,7 @@ Run `sqly` without `--sql` to open the shell. It behaves like `sqlite3` or `mysq
 
 ```shell
 $ sqly testdata/user.csv
-sqly v0.22.0
+sqly v0.23.0
 
 enter "SQL query" or "sqly command that begins with a dot".
 .help print usage, .exit exit sqly.
@@ -433,7 +433,7 @@ SELECT * FROM `customers100000` WHERE `Index` BETWEEN 1000 AND 2000 ORDER BY `In
 |--------:|--------:|------------:|--------------:|-------------------:|
 | 100,000 | 12 | 515 ms | 161 MB | 2.82M |
 
-Measured on an AMD Ryzen 7 5800U, Go 1.25, sqly v0.22.0. Run `make bench` to reproduce on your machine.
+Measured on an AMD Ryzen 7 5800U, Go 1.25, sqly v0.23.0. Run `make bench` to reproduce on your machine.
 
 ## Comparison with similar tools