utaz: add case management sensitivity support

doc/CHANGELOG.md

@@ -7,6 +7,29 @@ Versions follow `MAJOR.MINOR.PATCH-REVISION_STAGE_N` (e.g. `3.99.1-4_rc_1`).
 
 ---
 
+## [Unreleased]
+
+### Added
+
+- `utaz -i` / `--ignore-case` and `-s` / `--case-sensitive` switches to match
+  archive extensions case-insensitively or not; the default is set by the new
+  `UTAZ_DEFAULT_IGNORE_CASE` key of the `[compress]` section (default `0`).
+- `utaz` supports bare `.zst` files and `.tzst` archives; `taz -q` is now
+  effective.
+
+### Fixed
+
+- `taz`: a plain file with the `tar` format could be deleted instead of being
+  archived; existing `<item>.tar` files are no longer overwritten; trailing
+  slashes, `.`/`..` and names starting with `-` are handled; the `gzip`
+  fallback (no `pigz`) works again.
+- `utaz`: single top-level directory flattening, `--no-dir` target location,
+  `foo.tar.gz` host directory name and `.tar.lz` extraction.
+- `compress.sh`: option flags and loop variables no longer leak into the
+  interactive shell.
+
+---
+
 ## [4.1.0] — 2026-05-07
 
 ### Added