feat: expose worker model and context metadata

crates/worker-runtime/src/http_server.rs

@@ -3992,6 +3992,8 @@ mod ws_tests {
                     tools: Vec::new(),
                     context_window: 0,
                     context_tokens: 0,
+                    reasoning: None,
+                    context_usage: None,
                 },
                 state: protocol::WorkerStateSnapshot::initial(),
                 in_flight: protocol::InFlightSnapshot {

crates/worker-runtime/src/runtime.rs

@@ -5474,6 +5474,7 @@ mod tests {
             worker,
             revision,
             status,
+            greeting: None,
             session: protocol::SessionSnapshot {
                 pending_submissions: protocol::PendingSubmissionsSnapshot::default(),
                 entries: Vec::new(),
@@ -5499,6 +5500,8 @@ mod tests {
                 tools: Vec::new(),
                 context_window: 0,
                 context_tokens: 0,
+                reasoning: None,
+                context_usage: None,
             },
             state: protocol::WorkerStatus::Idle.into(),
             in_flight: protocol::InFlightSnapshot::default(),
@@ -8111,6 +8114,8 @@ mod tests {
                     tools: Vec::new(),
                     context_window: 128,
                     context_tokens: 64,
+                    reasoning: None,
+                    context_usage: None,
                 },
                 state: protocol::WorkerStatus::Running.into(),
                 in_flight: protocol::InFlightSnapshot {

crates/worker-runtime/src/worker_backend.rs

@@ -4520,6 +4520,8 @@ mod tests {
                 tools: Vec::new(),
                 context_window: 1_000,
                 context_tokens: 0,
+                reasoning: None,
+                context_usage: None,
             },
         ));
         hub.workers.lock().unwrap().insert(