Merge branch 'main' into dev

Resolve 38 conflicts preserving both sides' work:
- Server: DB-based registries (dev) + WorkspaceGitService/DaemonConfigStore (main)
- App: script proxy/voice MCP (dev) + pin/hide tabs/bootstrap boundary (main)
- Shared: WorkspaceScriptPayload (dev) + git/GitHub runtime schemas (main)
- Deleted workspace-registry-bootstrap.ts (dev's DB approach supersedes)

packages/app/src/stores/session-store.ts

@@ -122,7 +122,6 @@ export interface WorkspaceDescriptor {
   workspaceKind: WorkspaceDescriptorPayload["workspaceKind"];
   name: string;
   status: WorkspaceDescriptorPayload["status"];
-  activityAt: Date | null;
   diffStat: { additions: number; deletions: number } | null;
   scripts: WorkspaceDescriptorPayload["scripts"];
 }
@@ -130,7 +129,6 @@ export interface WorkspaceDescriptor {
 export function normalizeWorkspaceDescriptor(
   payload: WorkspaceDescriptorPayload,
 ): WorkspaceDescriptor {
-  const activityAt = payload.activityAt ? new Date(payload.activityAt) : null;
   return {
     id: normalizeWorkspaceIdentity(String(payload.id)) ?? String(payload.id),
     projectId: String(payload.projectId),
@@ -141,7 +139,6 @@ export function normalizeWorkspaceDescriptor(
     workspaceKind: payload.workspaceKind,
     name: payload.name,
     status: payload.status,
-    activityAt: activityAt && !Number.isNaN(activityAt.getTime()) ? activityAt : null,
     diffStat: payload.diffStat ?? null,
     scripts: (payload.scripts ?? []).map((s) => ({ ...s })),
   };