[Bug] UltraReview consumed quota on failed runs without completing review

## Summary

/ultrareview (no-argument / current-branch form) reproducibly fails. The
pipeline reaches Setup ✓ → Find ✓ → Verify ✗ ("Review failed"), and the
Dedupe stage never starts. It failed 2/2 consecutive runs — and each failed
run still consumed one of the 3 free /ultrareview runs.

## Environment

• Claude Code 2.1.146
• macOS 26.5
• Standard git repo; review target review/all-unmerged-0521 → main,

~52 files / ~4,500 insertions

## Repro

1. On a multi-commit branch, run /ultrareview with no arguments.
2. Confirm the launch dialog; the review runs in the cloud.
3. Watch the pipeline view.

## Expected

The review completes Setup → Find → Verify → Dedupe and returns findings.
A run that fails before completing should not consume a free-run credit.

## Actual

• Setup ✓
• Find ✓ (run 1 surfaced 2 candidates; run 2 surfaced 1)
• Verify ✗ — red error icon, header changes to "Review failed"
• Dedupe — never starts
• The heartbeat log pane is empty apart from a single [heartbeat] HH:MM:SS

line — no error detail, no explanation of why Verify failed.

Both failed runs were still counted against the quota
("Free ultrareview 1 of 3", then "2 of 3").

## Secondary bug — a failed review is indistinguishable from a clean one

When a run fails at Verify, the completion notification still reports
status: completed with an empty findings array []. Anything
consuming the result — or a user reading "0 findings" — cannot tell a
failed review from a genuinely clean one. A failed run should surface a
distinct error status rather than completed + [].

## Failed sessions

• Run 1 — session_01ShwA5SdXgiaYr3gqs5qr2L
• Run 2 — session_018meDNWV8cSGTmVi4A82ZWU

## Impact

• /ultrareview is currently unusable on this repo (2/2 runs failed).
• 2 of 3 free runs consumed for zero completed reviews.
• The completed + []-on-failure behavior risks a false "clean review"

signal to both users and tooling.

<img width="1406" height="485" alt="Image" src="https://github.com/user-attachments/assets/2b210e18-c1ad-4b06-81b6-e78b236bfe18" />

<img width="1390" height="488" alt="Image" src="https://github.com/user-attachments/assets/b61be278-0885-4e88-9f3c-0a5dabf89b44" />