E4: Failure Notification — Rich Detail

[ShortCipher5]

Failure notifications must carry enough detail for developers to diagnose issues without opening multiple screens.

References: PRD §6.5

Acceptance Criteria

• Shows: which step failed (e.g. "Build - step 2 of 8")
• Last 20 lines of log output from failed step with "View full logs" link
• Whether rollback was attempted and its outcome
• Plain-language AI suggestion for recognised failure patterns (missing env var, OOM during build, health check path returning 404)
• Detail surfaced in both in-app tray AND external channel payload