[BUG] /ultrareview returned empty findings ([]) on large-scope branch — free credit consumed

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

## Summary
/ultrareview returned empty findings ([]) on a large-scope branch review,
and the free credit was still decremented (counter advanced from "1 of 3" to "2 of 3").
This matches the pattern reported in #50029, #53010, #54516, and #54871.

## Environment

• Platform: macOS (Darwin 25.4.0)
• Shell: zsh
• Claude Code: CLI
• Model: Opus 4.7

## Repro

1. On branch review/phase-23-wide (target: main)
2. Run /ultrareview (no args)
3. CLI reports:

• Free ultrareview 2 of 3.
• Scope: 177 files changed, 22173 insertions(+), 8044 deletions(-)
• Track URL issued, ~5–10 min cloud run

1. Task notification arrives: status: completed, summary: Remote review completed
2. Findings payload: []

## Session details

• Session ID: session_01BeLYYxmoA8VTjVrfTPP5DM
• Branch: review/phase-23-wide → main
• Diff size: 177 files, +22173 / −8044
• Result: empty findings array
• Credit state after run: 2 of 3 free runs consumed

What Should Happen?

## Expected
Either:

• (a) Findings returned for a diff of this size, OR
• (b) Free credit NOT decremented when the remote agent returns an empty payload

on a non-trivial diff (server-side failure indistinguishable from a clean codebase).

## Actual
Empty [] returned with no error surfaced to the user, free credit consumed.

Error Messages/Logs

Steps to Reproduce

This matches the pattern reported in #50029, #53010, #54516, and #54871.

## Related

• #50029, #53010, #54516, #54871, #49905

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.128

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

## Request
Please restore the consumed free credit for session
session_01BeLYYxmoA8VTjVrfTPP5DM, and consider gating the credit decrement
on a non-empty response (or a clear "clean codebase" signal distinct from
silent server-side failure).

## Related

• #50029, #53010, #54516, #54871, #49905