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test: fix NPE in child context completion tests #990

Job	Run time
ai-pr-review / Record AI review activity	7s
ai-pr-review / Resolve AI PR review	-1s
ai-pr-review / Codex review	0s
ai-pr-review / Claude review	0s
ai-pr-review / Record AI review activity	5s
ai-pr-review / Resolve AI PR review	-62s
ai-pr-review / Codex review	0s
ai-pr-review / Claude review	0s
	-51s