test(tui): cover auto review lifecycle metadata gap

[cbusillo]

Summary

• extract Auto Review active-run matching into an AutoReviewRunIdentity helper
• treat missing session/snapshot metadata as non-authoritative without permanently marking the agent processed
• add a lifecycle regression that ignores a pre-start metadata-free terminal status, then accepts the later matching status after start metadata arrives

Validation

• cargo test -p code-tui --features test-helpers auto_review
• git diff --check
• ./build-fast.sh

Closes part of #76 by adding deterministic lifecycle coverage for stale/slow Auto Review event ordering.