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>

.github/workflows/ci.yml

@@ -69,6 +69,19 @@ jobs:
         run: CC=/usr/bin/clang tests/boot.sh
       - name: Language server
         run: python3 tests/lsp_test.py
+      - name: Apple frameworks
+        run: |
+          cat > fw.fch <<'EOF'
+          import "CoreFoundation/CoreFoundation.h"
+          link "CoreFoundation.framework"
+
+          fn main() {
+              print(CFAbsoluteTimeGetCurrent() > 0.0)
+          }
+          EOF
+          out=$(CC=/usr/bin/clang build/finch run fw.fch)
+          echo "$out"
+          test "$out" = "true"
       - name: Package
         run: |
           mkdir -p dist/finch && cp build/finch README.md LICENSE dist/finch/ && cp -r examples dist/finch/