Stan plugin for JetBrains IDEs.

Currently supports:

• Syntax highlighting (configurable: Settings → Editor → Color Scheme → Stan)
• Syntax validation (Full AST parsing internally)
• Code folding (on {} blocks)
• Basic autocompletion (all builtins, keywords, variable names in scope)
• Basic type checking
• Semantic checks for unused variables
• Semantic checks for name shadowing
• Create a new Stan file from the file explorer context menu

Reuses syntax and semantics defined in Stanc3.

Vibe coded slop, so probably contains many bugs, is incomplete, inefficient and has fugly implementation. But overall seems to work kinda OK. Reports & PRs are wellcome.

See CLAUDE.md for internal details on implementation design.