- Grammar: update pointer_type to support optional mut keyword;
LL(1) verified (56 named rules, no conflicts)
- AST: update Type enum with mutable: bool field for Pointer and
OpaquePointer variants
- Parser: consume optional mut token in parse_type; update all
existing pointer tests; add 4 new mut pointer tests (85 pass)
- VSCode extension: add *mut capture-group pattern for syntax
highlighting; update SYNTAX.md with pointer mutability table
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add compound assignment operators (+=, -=, *=, /=, %=, &=, |=, ^=,
<<=, >>=) and shift operators (<<, >>) to the tmLanguage syntax
highlighting grammar. Patterns are ordered longest-first to prevent
shorter tokens from shadowing multi-character operators. Also update
fibonacci example to use += compound assignment.
Adds the vscode-flux extension with TextMate grammar covering keywords,
types, literals, operators, comments, and function/struct name highlighting.
Supports .flux and .flx file extensions.
