Finch 2.4.0: methods, maps, errors as values; str() of any value; macOS and ARM64 docs; Kate support

- fn Struct.method(...) with self by reference, also on C structs
- map[K]V: insertion-ordered hash maps, literals, m[k] += 1, has/get/remove/keys/values
- -> T! / -> !, return error(...), or <value>, or { err }, try; fallible int/float/read_file/write_file/delete_file
- for i, x in list / for k, v in map
- print and str() share one text formatter
- LSP: method and map completion, method signatures; grammar and snippets for VS Code and Kate
- tests: 74 (methods, errors, maps + 11 failure cases); docs at all three levels, en and pl

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

editors/vscode/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 2.4.0
+
+- Highlighting for methods (`fn Point.move`), maps (`map[K]V`), `or`, `try`, `self` and `error(...)`.
+- Completion for struct methods and map methods; parameter hints for method calls.
+- Snippets: `method`, `fnf` (a function that can fail), `map`, `forkv`, `orb`.
+
 ## 2.3.0
 
 - First release: highlighting, snippets, language server, Run and Build.