refactor: replace overloaded surface terminology

packages/bash/tool-pwsh/tests/tools.spec.ts

@@ -139,7 +139,7 @@ async function setup(toolConfig: Partial<ToolPwsh.Config> = {}, dshHome?: string
   return { ctx, bash }
 }
 
-/** Full harness: the generic task runtime + its control surface, then the pwsh tool. */
+/** Full harness: the generic task runtime + its controller, then the pwsh tool. */
 async function setupWithTasks(toolConfig: Partial<ToolPwsh.Config> = {}, dshHome?: string) {
   const ctx = new Context()
   await ctx.plugin(SystemPrompt)
@@ -766,7 +766,7 @@ describe('background execution through the task runtime', () => {
   })
 
   it('never spawns the process when tasks.start preflight throws (no orphan, by construction)', async () => {
-    // With no control surface, task preflight fails before the executor can spawn.
+    // With no task controller, preflight fails before the executor can spawn.
     const ctx = new Context()
     await ctx.plugin(SystemPrompt)
     await ctx.plugin(ToolRegistry)
@@ -778,7 +778,7 @@ describe('background execution through the task runtime', () => {
 
     const result = await call(ctx, 'pwsh', { command: 'Start-Sleep -Seconds 60', description: 'test command', run_in_background: true })
     expect(result.isError).toBe(true)
-    expect(text(result)).toContain('no control surface serves this agent')
+    expect(text(result)).toContain('no task controller serves this agent')
     // Declare-then-execute: the failed preflight means no process ever ran.
     expect(bash.startCalls).toBe(0)
   })