Intent of claudePromptQueue.test|title=ClaudePromptQueue isEmpty is true after every pushed entry has been yielded and settled|occurrence=1, claudePromptQueue.test|title=ClaudePromptQueue intermediate settleHead while another entry is queued does NOT settle the popped entry — batches until full drain (M10 invariant)|occurrence=1

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.