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/lsp/completion.rs

@@ -228,6 +228,7 @@ fn format_value_type(value: &Value) -> String {
         | Value::Duration(_) => "Duration".to_string(),
         | Value::ProseBlock(_) => "ProseBlock".to_string(),
         | Value::Override(_) => "Override".to_string(),
+        | Value::Any => "Any".to_string(),
     }
 }
 
@@ -564,7 +565,6 @@ fn entity_completions(doc: &Document) -> Vec<CompletionItem> {
             | DeclKind::Relationship => CompletionItemKind::STRUCT,
             | DeclKind::Location => CompletionItemKind::CONSTANT,
             | DeclKind::Species => CompletionItemKind::CLASS,
-            | DeclKind::Enum => CompletionItemKind::ENUM,
         };
 
         let name = entry
@@ -682,7 +682,6 @@ fn top_level_keyword_completions() -> Vec<CompletionItem> {
         keyword_item("relationship", "Define a relationship", "relationship ${1:Name} {\n    $0\n}"),
         keyword_item("location", "Define a location", "location ${1:Name} {\n    $0\n}"),
         keyword_item("species", "Define a species", "species ${1:Name} {\n    $0\n}"),
-        keyword_item("enum", "Define an enumeration", "enum ${1:Name} {\n    ${2:Value1}\n    ${3:Value2}\n}"),
         keyword_item("use", "Import declarations", "use ${1:path::to::item};"),
     ]
 }