Fix windowsVerbatimArguments dropped in waited spawn path and remove unused DesktopLauncherError export

- Pass windowsVerbatimArguments from resolveSpawnInput through to
  ChildProcess.make in spawnPlan, matching the detached path behavior.
  Previously the flag was computed but discarded, risking double-escaped
  cmd.exe arguments on Windows waited launches.

- Remove unused DesktopLauncherError union schema export from
  Services/DesktopLauncher.ts (dead code with no imports).

- Fix test harness to conditionally include windowsVerbatimArguments
  only when defined, fixing pre-existing deepEqual assertion failures.

Author: cursoragent

apps/server/src/process/Layers/DesktopLauncher.test.ts

@@ -67,6 +67,7 @@ function spawnerLayer(
         readonly options: {
           readonly detached?: boolean;
           readonly shell?: boolean | string;
+          readonly windowsVerbatimArguments?: boolean;
           readonly stdin?: unknown;
           readonly stdout?: unknown;
           readonly stderr?: unknown;
@@ -78,6 +79,9 @@ function spawnerLayer(
         args: [...standardCommand.args],
         detached: standardCommand.options.detached,
         shell: standardCommand.options.shell,
+        ...(standardCommand.options.windowsVerbatimArguments !== undefined
+          ? { windowsVerbatimArguments: standardCommand.options.windowsVerbatimArguments }
+          : {}),
         stdin: standardCommand.options.stdin,
         stdout: standardCommand.options.stdout,
         stderr: standardCommand.options.stderr,
@@ -153,7 +157,9 @@ function spawnHarness(
         args: [...input.args],
         detached: input.detached,
         shell: input.shell,
-        windowsVerbatimArguments: input.windowsVerbatimArguments,
+        ...(input.windowsVerbatimArguments !== undefined
+          ? { windowsVerbatimArguments: input.windowsVerbatimArguments }
+          : {}),
         stdin: input.stdin,
         stdout: input.stdout,
         stderr: input.stderr,

apps/server/src/process/Layers/DesktopLauncher.ts

@@ -749,6 +749,9 @@ export const make = Effect.fn("makeDesktopLauncher")(function* (
         ChildProcess.make(input.command, [...input.args], {
           detached: plan.detached,
           shell: plan.shell,
+          ...(input.windowsVerbatimArguments !== undefined
+            ? { windowsVerbatimArguments: input.windowsVerbatimArguments }
+            : {}),
           ...(plan.stdio === "ignore"
             ? {
                 stdin: "ignore",

apps/server/src/process/Services/DesktopLauncher.ts

@@ -127,16 +127,6 @@ export class DesktopLauncherLaunchAttemptsExhaustedError extends Schema.TaggedEr
   }
 }
 
-export const DesktopLauncherError = Schema.Union([
-  DesktopLauncherCommandNotFoundError,
-  DesktopLauncherDiscoveryError,
-  DesktopLauncherLaunchAttemptsExhaustedError,
-  DesktopLauncherNonZeroExitError,
-  DesktopLauncherSpawnError,
-  DesktopLauncherUnknownEditorError,
-  DesktopLauncherValidationError,
-]);
-
 export interface OpenInEditorInput {
   readonly cwd: string;
   readonly editor: EditorId;