feat(gastown): speed up mayor session startup

apps/web/src/components/gastown/MayorChat.tsx

@@ -22,7 +22,22 @@ export function MayorChat({ townId }: MayorChatProps) {
   // Eagerly ensure mayor agent + container on mount
   const ensureMayor = useMutation(
     trpc.gastown.ensureMayor.mutationOptions({
-      onSuccess: () => {
+      onSuccess: data => {
+        queryClient.setQueryData(
+          trpc.gastown.getMayorStatus.queryKey({ townId }),
+          (old: { configured?: boolean; townId?: string; session?: { agentId?: string; sessionId?: string; status?: string; lastActivityAt?: string } } | undefined) => ({
+            ...(old ?? {}),
+            configured: true,
+            townId,
+            session: {
+              ...(old?.session ?? {}),
+              agentId: data.agentId,
+              sessionId: data.agentId,
+              status: data.sessionStatus,
+              lastActivityAt: old?.session?.lastActivityAt ?? new Date().toISOString(),
+            },
+          })
+        );
         void queryClient.invalidateQueries({
           queryKey: trpc.gastown.getMayorStatus.queryKey(),
         });

apps/web/src/components/gastown/TerminalBar.tsx

@@ -1319,7 +1319,22 @@ function MayorTerminalPane({ townId, collapsed }: { townId: string; collapsed: b
 
   const ensureMayor = useMutation(
     trpc.gastown.ensureMayor.mutationOptions({
-      onSuccess: () => {
+      onSuccess: data => {
+        queryClient.setQueryData(
+          trpc.gastown.getMayorStatus.queryKey({ townId }),
+          (old: { configured?: boolean; townId?: string; session?: { agentId?: string; sessionId?: string; status?: string; lastActivityAt?: string } } | undefined) => ({
+            ...(old ?? {}),
+            configured: true,
+            townId,
+            session: {
+              ...(old?.session ?? {}),
+              agentId: data.agentId,
+              sessionId: data.agentId,
+              status: data.sessionStatus,
+              lastActivityAt: old?.session?.lastActivityAt ?? new Date().toISOString(),
+            },
+          })
+        );
         void queryClient.invalidateQueries({
           queryKey: trpc.gastown.getMayorStatus.queryKey(),
         });

services/gastown/container/src/agent-runner.ts

@@ -372,6 +372,10 @@ async function verifyGitCredentials(
  * kilo serve requires a git repo in the working directory, so we init
  * a bare local repo with an empty initial commit.
  */
+export function mayorWorkdirForTown(townId: string): string {
+  return `/workspace/rigs/mayor-${townId}/mayor-workspace`;
+}
+
 async function createLightweightWorkspace(label: string, rigId: string): Promise<string> {
   const { mkdir: mkdirAsync } = await import('node:fs/promises');
   const { existsSync } = await import('node:fs');