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>

extensions/vscode/README.md

@@ -24,4 +24,11 @@ Decoding runs in plain JavaScript inside the preview; no native code.
   code --install-extension yapf-preview-1.0.0.vsix
   ```
 
-Works in VS Code, VSCodium and other VS Code–based editors (1.75+).
+Should work in VS Code 1.75+ and VS Code–based editors such as VSCodium.
+
+## Status
+
+The `.vsix` packages cleanly, and the preview code was tested in a browser
+engine (headless Chromium) with real files: correct pixels, mip picker,
+error message for corrupt files.  **It has not yet been run inside VS Code
+itself.**