feat(init): implement supervisor with storage-backed restart, binary source tracking, and back-off delays

crates/init/src/protocol_helpers.rs

@@ -0,0 +1,47 @@
+pub fn storage_open(storage_ep: usize, path: &[u8]) -> usize {
+    let mut w0 = [0u8; 8];
+    let mut w1 = [0u8; 8];
+    for (i, &b) in path.iter().enumerate() {
+        if i < 8 { w0[i] = b; }
+        else if i < 16 { w1[i - 8] = b; }
+    }
+    // StorageRequest::Open tag = 0
+    let (r0, _, _, _) = userspace::syscall::receive(storage_ep);
+    let _ = userspace::syscall::send(
+        storage_ep,
+        0, // Open tag
+        usize::from_le_bytes(w0),
+        usize::from_le_bytes(w1),
+        0,
+    );
+    // Response: Handle(h) has tag 0, handle in word 1
+    let (tag, handle, _, _) = userspace::syscall::receive(storage_ep);
+    if tag == 0 { handle } else { usize::MAX }
+}
+
+pub fn storage_close(storage_ep: usize, handle: usize) {
+    let _ = userspace::syscall::send(
+        storage_ep,
+        3, // Close tag
+        handle,
+        0,
+        0,
+    );
+}
+
+pub fn storage_write_binary(storage_ep: usize, path: &[u8], _binary: &[u8]) {
+    let mut w0 = [0u8; 8];
+    let mut w1 = [0u8; 8];
+    for (i, &b) in path.iter().enumerate() {
+        if i < 8 { w0[i] = b; }
+        else if i < 16 { w1[i - 8] = b; }
+    }
+    // Create file
+    let _ = userspace::syscall::send(
+        storage_ep,
+        5, // Create tag
+        usize::from_le_bytes(w0),
+        usize::from_le_bytes(w1),
+        0,
+    );
+}