Stop daemon crashes from terminal-list worker timeouts

getTerminals was the only terminal read that round-tripped the terminal
worker process. Under load the IPC call could hit its 10s timeout, and
the rejection from a fire-and-forget workspace-update emit propagated as
an unhandled rejection — taking down the whole daemon.

The daemon already maintains an authoritative mirror of terminal state
(every other read is served from it), so getTerminals now reads that
mirror locally, preserving the worker's descendant-path aggregation and
absolute-path guard. The getTerminals worker IPC request is removed
entirely, so no terminal read can stall on the worker anymore.

Also adds a defensive .catch to the two fire-and-forget workspace-update
sites, and hoists the duplicated assertAbsolutePath guard into one shared
helper in path-utils.

packages/server/src/terminal/terminal-worker-process.ts

@@ -241,19 +241,6 @@ async function handleCreateTerminalRequest(message: TerminalCreateRequest): Prom
 
 async function handleRequest(message: TerminalWorkerRequest): Promise<void> {
   switch (message.type) {
-    case "getTerminals": {
-      const terminals = await manager.getTerminals(message.cwd, {
-        workspaceId: message.workspaceId,
-      });
-      sendToParent({
-        type: "response",
-        requestId: message.requestId,
-        ok: true,
-        result: terminals.map(toTerminalInfo),
-      });
-      return;
-    }
-
     case "createTerminal": {
       await enqueueCreateTerminalRequest(message);
       return;