Phase 8 follow-up: resolve the child named in the question

The Hub forwards `person` equal to the asker (`PersonOrDefault`), so the spoken
question "what does Harry have on today at school?" arrives with person "sam"
and returned "no data for that person" (found by the Hub agent on AUD-116).

resolveChild now falls back to the question text when the requested person is
not one of this project's children: whole-word, case-insensitive match against
the child names this service already publishes in /capabilities. An explicit
person still wins, two named children still return answer:null, and the
permission check still runs on the resolved child. No model, no free text.

Live end-to-end through the Hub, with no person field:

  POST http://192.168.20.13:8788/ask
  {"text":"what does Harry have on today at school?","asker":"sam","source":"console"}
  200
  {"status":"ok",
   "answer":"Harry has 8 school events today from 8:55am to 6:00pm and 6 overdue tasks.",
   "route":{"kind":"project","project":"compass_nhs"}}

Image 0.6.1-phase8; docs/phase-8-hub-notes.md records the fallback and the
end-to-end transcript.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docker-compose.yml

@@ -10,8 +10,8 @@ services:
     build:
       context: .
       args:
-        VERSION: "0.6.0-phase8"
-    image: compass-teams-nhs/school:0.6.0-phase8
+        VERSION: "0.6.1-phase8"
+    image: compass-teams-nhs/school:0.6.1-phase8
     container_name: compass-teams-nhs
     restart: unless-stopped
     env_file: