fix(server): name a prompt-less Codex child in its late wake

A spawnAgent call without a prompt registers the child with an empty
prompt and no title, so the wake header and notification label were
blank and the task id fallback never applied.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1fba4795e3Julius Marminge committed on 10/22/2026, 9:23:01 PMparentb80e32b

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