Language bindings, KDE thumbnails, yapf compare, in-memory encoding

- yapf_encode() / yapf_free_buffer(): encode to memory; yapf_save uses it
- yapf.c also compiles as C++
- `yapf compare`: size and decode speed of the original format vs YAPF,
  with a lossless check
- bindings with tested examples: C++ (header-only), C# (P/Invoke),
  Rust (crate, builds the C code), Go (cgo), Java (FFM API, Java 22+),
  Zig (@cImport), LuaJIT (FFI), TypeScript types for the JS port;
  Python now encodes in memory
- docs/LANGUAGES.md and examples/ with measured results
- KDE Dolphin thumbnail plugin (KF6, CMake)
- README: honest status for Photoshop / VS Code / Figma (not run in the
  apps yet) and macOS (cross-compiled only), platform table

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/build_release.sh

@@ -11,6 +11,7 @@
 #   yapf-figma.zip             Figma plugin (import via manifest.json)
 #   yapf-photoshop.zip         Photoshop scripts
 #   yapf-gimp-source.zip       GIMP plugin source (build with gimptool)
+#   yapf-kde-source.zip        Dolphin thumbnail plugin source (build with CMake)
 set -euo pipefail
 cd "$(dirname "$0")/.."
 OUT=dist/release
@@ -55,4 +56,5 @@ fi
 python3 -m zipfile -c "$OUT/yapf-figma.zip" extensions/figma/manifest.json extensions/figma/code.js extensions/figma/ui.html
 python3 -m zipfile -c "$OUT/yapf-photoshop.zip" extensions/photoshop
 python3 -m zipfile -c "$OUT/yapf-gimp-source.zip" extensions/gimp yapf.c yapf.h
+python3 -m zipfile -c "$OUT/yapf-kde-source.zip" extensions/kde extensions/linux/yapf-mime.xml yapf.c yapf.h
 ls -la "$OUT"