worker: support typed initial submit on spawn

crates/protocol/Cargo.toml

@@ -8,8 +8,10 @@ license.workspace = true
 default = ["stream"]
 stream = ["dep:tokio"]
 typescript = ["dep:ts-rs"]
+json-schema = ["dep:schemars"]
 
 [dependencies]
+schemars = { workspace = true, optional = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 tokio = { workspace = true, features = ["io-util"], optional = true }

crates/protocol/src/lib.rs

@@ -183,6 +183,7 @@ impl WorkerEvent {
 /// the dropped intent.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+#[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
 #[serde(tag = "kind", rename_all = "snake_case")]
 pub enum Segment {
     /// Free-form text. The fallback every client can produce.