feat: observe retained worker sessions without restore

crates/client/Cargo.toml

@@ -8,11 +8,13 @@ license.workspace = true
 async-trait.workspace = true
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
 protocol = { workspace = true }
+runtime-api.workspace = true
 ticket = { workspace = true }
 futures = { workspace = true }
 reqwest = { version = "0.13", default-features = false, features = ["blocking", "json", "native-tls"] }
 serde = { workspace = true }
 serde_json = { workspace = true }
+server-api.workspace = true
 thiserror = { workspace = true }
 tokio = { workspace = true, features = ["rt", "macros", "net", "io-util", "sync", "time"] }
 tokio-tungstenite = { workspace = true }

crates/client/src/backend_runtime.rs

@@ -28,7 +28,7 @@ pub use workspace_api::{
     WorkingDirectorySummary as BackendWorkingDirectorySummary,
 };
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct BackendRuntimeTarget {
     /// Workspace Backend API root URL, for example `http://127.0.0.1:8787`.
     /// This is intentionally the Backend endpoint, not a Runtime endpoint.
@@ -39,6 +39,7 @@ pub struct BackendRuntimeTarget {
     pub runtime_id: String,
     /// Backend-owned Worker identity used as path authority.
     pub worker_id: String,
+    pub initial_snapshot: Option<protocol::SessionSnapshot>,
 }
 
 impl BackendRuntimeTarget {
@@ -53,6 +54,7 @@ impl BackendRuntimeTarget {
             workspace_id: workspace_id.into(),
             runtime_id: runtime_id.into(),
             worker_id: worker_id.into(),
+            initial_snapshot: None,
         }
     }
 

crates/client/src/lib.rs

@@ -40,6 +40,8 @@ pub use backend_workspace::{
     list_backend_workspaces_blocking,
 };
 pub use client::{Client, ClientError};
+pub use runtime_api::{WorkerSessionAvailability, WorkerSessionUnavailableReason};
+pub use server_api::{ServerApi, ServerApiClient, WorkspaceWorkerSessionResponse};
 pub use target::{
     BackendTarget, BackendWorkerLaunch, Dashboard, ResolvedTarget, StandaloneTarget,
     StandaloneWorkerListIntent, StandaloneWorkerResumeIntent, Target, TargetError, TargetKind,

crates/client/src/target.rs

@@ -134,7 +134,7 @@ pub struct WorkerList {
     pub include_stopped: bool,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct WorkerConnection {
     pub target: BackendRuntimeTarget,
 }