c interop type foundation

LANGUAGE.md

@@ -12,17 +12,24 @@
 
 ### types and expressions
 
-- `i8`, `i16`, `i32`, `i64`, `void`, and inferred integer-constrained `int`
+- exact-width `i8` through `i64`, `u8` through `u64`, `f32`, `f64`, `isize`, `usize`, `void`, and inferred integer-constrained `int`
+- target-dependent atomic C primitives from `c_char` through `c_longdouble`
+- C primitives remain semantically distinct from exact-width Brolang primitives until target lowering
 - contextual integer literals and constant folding of addition and negation trees
-- checked signed integer addition and unary negation
-- function calls, assignments, and returns
+- strict numeric conversions, checked integer addition, and unary negation
+- arrays `[N]T`, sentinel arrays `[N;S]T`, indexing, pointers, pointer offsets, slices, and explicit slicing
+- immutable UTF-8 sentinel-slice strings and Unicode code-point character literals
+- optionals with trapping postfix `?`, `orelse`, and nullable pointer representation
+- source-order native structs, keyed literals, and defined or opaque pointer-only `c_struct`
+- postfix pointer dereference, explicit `.ptr`/`.len`, general writable locations, function calls, assignments, and returns
 
 ### functions and packages
 
 - demand-monomorphized functions
-- bodyful `c func` definitions using the c calling convention
-- bodyless `c func` declarations with exact, globally unique external symbol names
+- bodyful `c_func` definitions using the c calling convention
+- bodyless `c_func` declarations with exact, globally unique external symbol names
 - concrete-only foreign signatures
+- Apple Silicon C ABI scalar and pointer lowering, including narrow integer extension attributes
 - directory packages with merged declarations
 - file-local relative imports, aliases, and qualified member access
 
@@ -43,20 +50,12 @@
 
 ### scalar and compound types
 
-- unsigned integers, floats, characters, and target-dependent c scalar types
-- arrays `[N]T` and sentinel arrays `[N; S]T`
-- single-item pointers `@T` and many-item pointers `*T`
-- element and pointee mutability through `mut`, separate from binding mutability
-- slices `[]T` and sentinel slices `[; S]T`
-- string literals as immutable sentinel slices backed by static arrays
-- character literals
-- optionals with trapping `?` unwrap, `orelse` fallback, and nullable pointers
-- data-only native structs and target-layout `c struct` types
 - tuples and native variadic functions
+- C unions, C enums, and by-value C record ABI lowering
 
 ### c imports
 
 - c headers imported as synthetic package namespaces
 - typedefs, enums, opaque records, and external variables
 - function pointers, callbacks, macros, and static inline functions
-- target-specific by-value c record and union ABI lowering
+- target-specific by-value C record and union ABI lowering