restricted c header imports

TODO.md

@@ -1,4 +1,4 @@
-# "quick"/"easy" fixes
+# "quick" / "easy" fixes
 
 - for global initialization cycles, report also starting and ending lines
 
@@ -29,15 +29,14 @@
      - `Some :: c_struct`: opaque c-layout struct
      - defer passing c structs by value until target ABI classification exists
 
-2. restricted c header imports
+2. restricted c header imports (implemented)
    - treat an imported header as a synthetic, file-local package namespace
-     - `import "relative/path/to/header.h"`
-     - `other :: import "relative/path/to/header.h"`
+     - `native :: import "relative/path/to/header.h"`
    - import functions, typedefs, scalar types, and pointers to opaque records
    - keep implementation linking separate from header imports
    - cache imports by canonical header path and target/include/define configuration
    - diagnose unsupported declarations when referenced
-   - research libclang's c API behind a replaceable c importer boundary
+   - dynamically load libclang behind a replaceable c importer boundary
 
 3. c variadic calls
    - represent c variadics as a fixed parameter count plus a variadic flag