runtime: restore from metadata snapshot

.yoi/tickets/00001KXDYZ254/item.md

@@ -1,8 +1,8 @@
 ---
 title: 'Restore Worker without backend profile fetch'
-state: 'inprogress'
+state: 'done'
 created_at: '2026-07-13T14:44:12Z'
-updated_at: '2026-07-13T14:45:04Z'
+updated_at: '2026-07-13T14:55:17Z'
 assignee: null
 queued_by: 'yoi ticket'
 queued_at: '2026-07-13T14:45:04Z'

.yoi/tickets/00001KXDYZ254/thread.md

@@ -39,4 +39,42 @@ Ticket を `yoi ticket` が queued にしました。
 State changed to `inprogress`.
 
 
+---
+
+<!-- event: implementation_report author: hare at: 2026-07-13T14:55:17Z -->
+
+## Implementation report
+
+Changed active Worker restore so it does not fetch backend profile source archives.
+
+Root cause:
+- Worker metadata already contains the resolved manifest snapshot used by `Worker::restore_from_worker_metadata_with_context`.
+- `ProfileRuntimeWorkerFactory::restore_controller` still resolved `request.profile_source` before calling restore, so Runtime restart could fail if workspace-server/backend resource endpoint was not available yet.
+
+Changes:
+- Active restore now builds only a minimal builtin fallback manifest/loader and calls `Worker::restore_from_worker_metadata_with_context` directly.
+- The metadata `resolved_manifest_snapshot` remains the restore authority.
+- Backend profile source archive resolution is deferred to the pending/no-history fallback path only, where fresh Worker recreation still needs a manifest.
+
+Validation:
+- `cargo fmt`
+- `cargo check -q`
+- `cargo test -q -p worker-runtime --features fs-store,ws-server`
+- `cargo test -q -p yoi-workspace-server`
+- `cd web/workspace && deno task check && deno task test`
+- `git diff --check`
+- `nix build .#yoi --no-link`
+
+Note: README.md had pre-existing unrelated local modifications and was not included.
+
+
+---
+
+<!-- event: state_changed author: "yoi ticket" at: 2026-07-13T14:55:17Z from: inprogress to: done reason: cli_state field: state -->
+
+## State changed
+
+State changed to `done`.
+
+
 ---

crates/worker-runtime/src/worker_backend.rs

@@ -38,7 +38,7 @@ use tokio::runtime::Runtime;
 use tokio::sync::broadcast;
 
 use worker::{
-    Worker, WorkerController, WorkerError, WorkerFilesystemAuthority, WorkerHandle,
+    PromptLoader, Worker, WorkerController, WorkerError, WorkerFilesystemAuthority, WorkerHandle,
     WorkerWorkspaceContext, WorkspaceId,
 };
 
@@ -181,6 +181,16 @@ impl ProfileRuntimeWorkerFactory {
     ) -> Option<std::borrow::Cow<'a, str>> {
         self.runtime_profile_for_request(&request.request)
     }
+
+    fn restore_fallback_manifest(
+        worker_name: &str,
+    ) -> Result<(manifest::WorkerManifest, PromptLoader), String> {
+        let mut config = manifest::WorkerManifestConfig::builtin_defaults();
+        config.worker.name = Some(worker_name.to_string());
+        let manifest = manifest::WorkerManifest::try_from(config)
+            .map_err(|err| format!("failed to build restore fallback manifest: {err}"))?;
+        Ok((manifest, PromptLoader::builtins_only()))
+    }
     async fn resolve_profile_source_archive(
         &self,
         source: &ProfileSourceArchiveSource,
@@ -397,7 +407,6 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
         request: WorkerExecutionRestoreRequest,
     ) -> Result<WorkerHandle, String> {
         let worker_name = Self::runtime_worker_name_for_ref(&request.worker_ref);
-        let profile = self.runtime_profile_for_request(&request.request);
         let worker_root = request
             .working_directory
             .as_ref()
@@ -416,21 +425,7 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
         let workspace_backend_ref =
             RuntimeWorkspaceBackendRef::from_working_directory(request.working_directory.as_ref());
         let workspace_context = workspace_backend_ref.worker_context();
-        let selector = profile.as_deref().unwrap_or("builtin:default");
-        let archive = self
-            .resolve_profile_source_archive(&request.request.profile_source)
-            .await?;
-        let (mut manifest, loader) = {
-            let manifest = archive
-                .resolve_profile(selector, &worker_root, &worker_name)
-                .map_err(|err| format!("failed to resolve profile source archive: {err}"))?;
-            worker::entrypoint::resolve_runtime_profile_manifest_from_manifest(
-                manifest,
-                &worker_root,
-                &worker_name,
-            )?
-        };
-        manifest.worker.name = worker_name.clone();
+        let (manifest, loader) = Self::restore_fallback_manifest(&worker_name)?;
 
         let store_dir = self.store_dir()?;
         let session_store = FsStore::new(&store_dir).map_err(|err| {
@@ -462,6 +457,24 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
             Err(WorkerError::WorkerMetadataPending { .. })
                 if request.request.initial_input.is_none() =>
             {
+                let profile = self.runtime_profile_for_request(&request.request);
+                let selector = profile.as_deref().unwrap_or("builtin:default");
+                let archive = self
+                    .resolve_profile_source_archive(&request.request.profile_source)
+                    .await?;
+                let (mut pending_manifest, pending_loader) = {
+                    let manifest = archive
+                        .resolve_profile(selector, &worker_root, &worker_name)
+                        .map_err(|err| {
+                            format!("failed to resolve profile source archive: {err}")
+                        })?;
+                    worker::entrypoint::resolve_runtime_profile_manifest_from_manifest(
+                        manifest,
+                        &worker_root,
+                        &worker_name,
+                    )?
+                };
+                pending_manifest.worker.name = worker_name.clone();
                 let session_store = FsStore::new(&store_dir).map_err(|err| {
                     format!(
                         "failed to initialize session store at {}: {err}",
@@ -477,9 +490,9 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
                     })?;
                 let store = CombinedStore::new(session_store, worker_metadata_store);
                 Worker::from_manifest_with_context(
-                    manifest,
+                    pending_manifest,
                     store,
-                    loader,
+                    pending_loader,
                     workspace_context,
                     filesystem_authority,
                 )