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

proptest-regressions/syntax/prop_tests.txt

@@ -7,3 +7,4 @@
 cc 8ac445fa78ef3f5ec7fb7d096cbe589988a9478352f82cdac195f5cea57ec47a # shrinks to name = "A", tag = "A", content = "\n¡"
 cc 739a6de85e6f514f93fc2d077e929658b31c65294dd44b192972ed882a42171a # shrinks to name = "A", tag = "in", content = ""
 cc 2649e200eb6e916c605196497e1ef5bca64d982d731f71d519c6048671e52ebd # shrinks to name = "if", state_name = "a", target = "A", val = true
+cc 4ab46dfeb431c0c3fe0e894c969f971fd35ae15eec23e51fe170d925c1889526 # shrinks to keyword = "enum"