test: close the merged branches' coverage gaps

Cover the fs-provider load path without a cancellation signal, the app-level
resumeCommand forwarding, and a command returning an error result.

packages/context/workspace-context/tests/workspace-context.spec.ts

@@ -383,6 +383,20 @@ describe('workspace context instruction discovery', () => {
     }
   })
 
+  it('loads through a FileSystem provider without a cancellation signal', async () => {
+    // Direct-library callers may omit `signal`; the fs-backed probe must pass
+    // no options object rather than `{ signal: undefined }`.
+    const ctx = new Context()
+    await ctx.plugin(RecordingFileSystem)
+    const fs = ctx.fs as RecordingFileSystem
+    fs.entries.set('/repo/.git', { type: 'directory' })
+    fs.entries.set('/repo/AGENTS.md', { type: 'file', content: 'signalless rule' })
+    const rendered = await loadBaselineInstructions({ cwd: '/repo', maxBytes: 65536 }, fs)
+    expect(rendered?.text).toContain('signalless rule')
+    expect(fs.signals).toHaveLength(0)
+    await ctx.fiber.dispose()
+  })
+
   it('skips a file that becomes unreadable after discovery without failing the request', async () => {
     const root = await tempRepo()
     const home = await tempRepo()

packages/examples/tui-demo/tests/tui-agent.spec.ts

@@ -33,6 +33,7 @@ describe('dsh-tui-demo app', () => {
       persistenceRoot: '/tmp/tui-sessions',
       persistenceCompression: 'none',
       welcome: 'TUI ready',
+      resumeCommand: 'dsh --resume {session}',
       ui: { color: false, maxToolOutputLines: 3 },
       skills: { tool: { catalogDescriptionMaxLength: 8 } },
       toolBash: { enableRunInBackground: false },
@@ -52,7 +53,12 @@ describe('dsh-tui-demo app', () => {
     expect(calls[0]?.config).toBeUndefined()
     expect(calls[2]?.config).toEqual({ root: '/tmp/tui-sessions', compression: 'none' })
     const tuiConfig = calls[4]?.config as { sessionId: string }
-    expect(tuiConfig).toMatchObject({ welcome: 'TUI ready', color: false, maxToolOutputLines: 3 })
+    expect(tuiConfig).toMatchObject({
+      welcome: 'TUI ready',
+      resumeCommand: 'dsh --resume {session}',
+      color: false,
+      maxToolOutputLines: 3,
+    })
     expect(tuiConfig.sessionId).toMatch(/^main-session-[0-9a-f-]{36}$/)
     const spineConfig = calls[5]?.config as {
       readonly agents: Array<Record<string, unknown>>

packages/ui/tui/tests/tui.spec.ts

@@ -1099,6 +1099,11 @@ describe('pi-tui chat lifecycle and transcript', () => {
       description: 'Fail a plugin command',
       handler: () => { throw new Error('plugin command exploded') },
     })
+    result.ctx.commands.register({
+      name: 'plugin-error',
+      description: 'Return an error result',
+      handler: () => ({ kind: 'error' as const, text: 'plugin error result' }),
+    })
 
     result.terminal.send('/plugin-check  value  ')
     result.terminal.send('\r')
@@ -1115,6 +1120,10 @@ describe('pi-tui chat lifecycle and transcript', () => {
     result.terminal.send('\r')
     await tick()
     expect(result.terminal.output).toContain('Command failed: plugin command exploded')
+    result.terminal.send('/plugin-error')
+    result.terminal.send('\r')
+    await tick()
+    expect(result.terminal.output).toContain('plugin error result')
     result.terminal.send('/help')
     result.terminal.send('\r')
     await tick()
@@ -1124,6 +1133,7 @@ describe('pi-tui chat lifecycle and transcript', () => {
     await result.controller.dispose()
     expect(result.ctx.commands.list(result.agent).map(command => command.name)).toEqual([
       'plugin-check',
+      'plugin-error',
       'plugin-fail',
     ])
     await result.ctx.fiber.dispose()