chore: import upstream snapshot with attribution

examples/readall-cli/src/main.0

@@ -0,0 +1,20 @@
+use reader
+
+use validate
+
+pub fn main(world: World) -> Void raises {
+    let fs: Fs = std.fs.host()
+    check seed(fs)
+    var storage: [126]u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+    var arena: FixedBufAlloc = std.mem.fixedBufAlloc(storage)
+    let maybe_body: Maybe<owned<ByteBuf>> = std.fs.readAll(arena, fs, ".zero/readall-cli.txt", 128)
+    if !maybe_body.has {
+        return
+    }
+    let body: owned<ByteBuf> = maybe_body.value
+    let bytes: MutSpan<u8> = std.mem.bufBytes(&body)
+    let len: usize = check validate_config(bytes)
+    if len == 16 {
+        check world.out.write("readall cli ok\n")
+    }
+}

examples/readall-cli/src/reader.0

@@ -0,0 +1,10 @@
+fn seed(fs: Fs) -> Void raises [WriteFailed] {
+    let created: Maybe<owned<File>> = std.fs.create(fs, ".zero/readall-cli.txt")
+    if created.has {
+        var file: owned<File> = created.value
+        if std.fs.writeAll(&mut file, std.mem.span("name=zero-agent\n")) {
+            return
+        }
+    }
+    raise WriteFailed
+}

examples/readall-cli/src/validate.0

@@ -0,0 +1,7 @@
+fn validate_config(body: Span<u8>) -> usize raises [EmptyInput] {
+    let len: usize = std.mem.len(body)
+    if len == 0 {
+        raise EmptyInput
+    }
+    return len
+}

examples/readall-cli/zero.toml

@@ -0,0 +1,7 @@
+[package]
+name = "readall-cli"
+version = "0.1.0"
+
+[targets.cli]
+kind = "exe"
+main = "src/main.0"