feat: add memory worker runtime crate

crates/worker-runtime/src/management.rs

@@ -0,0 +1,66 @@
+use crate::identity::RuntimeId;
+use serde::{Deserialize, Serialize};
+
+/// Runtime backend kind.  v0 intentionally ships only an embedded memory backend.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum RuntimeBackendKind {
+    Memory,
+}
+
+/// Runtime lifecycle state.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum RuntimeStatus {
+    Running,
+    Stopped,
+}
+
+/// Guardrails for bounded observation/projection APIs.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RuntimeLimits {
+    pub max_transcript_projection_items: usize,
+    pub max_event_batch_items: usize,
+}
+
+impl Default for RuntimeLimits {
+    fn default() -> Self {
+        Self {
+            max_transcript_projection_items: 256,
+            max_event_batch_items: 256,
+        }
+    }
+}
+
+/// Options used to construct an embedded memory Runtime.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RuntimeOptions {
+    pub runtime_id: Option<RuntimeId>,
+    pub display_name: Option<String>,
+    pub limits: RuntimeLimits,
+}
+
+impl Default for RuntimeOptions {
+    fn default() -> Self {
+        Self {
+            runtime_id: None,
+            display_name: None,
+            limits: RuntimeLimits::default(),
+        }
+    }
+}
+
+/// Management-plane summary for a Runtime.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RuntimeSummary {
+    pub runtime_id: RuntimeId,
+    pub display_name: Option<String>,
+    pub backend: RuntimeBackendKind,
+    pub status: RuntimeStatus,
+    pub worker_count: usize,
+    pub active_worker_count: usize,
+    pub stopped_worker_count: usize,
+    pub cancelled_worker_count: usize,
+    pub diagnostic_count: usize,
+    pub limits: RuntimeLimits,
+}