feat: supply process arguments through native startup

README.md

@@ -9,8 +9,9 @@ odin build . -out:build/brolang
 ./build/prototype
 ```
 
-Programs may receive the system I/O capability explicitly. Standard-stream
-helpers bind the provider, handle, and callback; `main func() ...` remains valid.
+Programs may receive system I/O and process arguments explicitly through
+`process.Init`; `main func() ...` remains valid. Standard-stream helpers bind the
+provider, handle, and callback.
 
 ```bro
 io :: import "@std/io"
@@ -23,6 +24,15 @@ main func(init process.Init) void {
 }
 ```
 
+`Init` contains `io io.Io` and `args process.Args`. `Args.values` is a borrowed
+`[][*;0]u8` view of native `argv`, with its length taken from `argc`: it includes
+the executable name at index 0 when present, without copying strings or the
+pointer array. `process.argument_count(init.args)` returns that count, and
+`process.argument(init.args, index)` returns a borrowed `?[;0]u8` (null when out
+of range). The helper scans only the requested zero-terminated argument; empty
+arguments remain empty slices. The slices are valid while their supplied
+argument storage lives.
+
 Bodyless `c_func` declarations bind exact external symbols and require concrete
 types. C primitives use atomic target-dependent names and remain semantically
 distinct from exact-width Brolang primitives: