feat(type-system): implement concept_comparison with pattern matching

Added complete support for the new type system syntax including:

- concept: Base type declarations
- sub_concept: Enum and record sub-type definitions
- concept_comparison: Compile-time pattern matching with conditional guards

Parser changes:
- Added VariantPattern, FieldCondition, and Condition AST nodes
- Implemented "is" keyword for pattern matching (e.g., "CupType is Glass or CupType is Plastic")
- Added Value::Any variant to support universal type matching
- Disambiguated enum-like vs record-like sub_concept syntax

LSP updates:
- Added Value::Any match arms across code_actions, completion, hover, inlay_hints, and semantic_tokens
- Type inference and formatting support for Any values

Example fixes:
- Fixed syntax error in baker-family behaviors (missing closing brace in nested if)
- Removed deprecated core_enums.sb file

src/syntax/keywords.rs

@@ -98,7 +98,6 @@ pub fn token_is_declaration_keyword(token: &Token) -> bool {
             Token::Relationship |
             Token::Institution |
             Token::Location |
-            Token::Enum |
             Token::Schedule
     )
 }
@@ -116,7 +115,6 @@ pub fn token_is_structural_keyword(token: &Token) -> bool {
             Token::Relationship |
             Token::Institution |
             Token::Location |
-            Token::Enum |
             Token::Schedule
     )
 }
@@ -132,7 +130,6 @@ pub fn declaration_token_to_str(token: &Token) -> Option<&'static str> {
         | Token::Relationship => Some("relationship"),
         | Token::Institution => Some("institution"),
         | Token::Location => Some("location"),
-        | Token::Enum => Some("enum"),
         | Token::Schedule => Some("schedule"),
         | _ => None,
     }