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>

internal/hub/hub_test.go

@@ -75,8 +75,12 @@ func harryData() *fakeReader {
 			{ID: 9, ChildID: 1, Type: "task", Subject: "11MGMA MATHS", Title: "SAC 4: Networks",
 				Body: "Status: Pending", DueAt: at(2026, 10, 19, 16, 0)},
 			{ID: 10, ChildID: 1, Type: "message", Title: "Health Information", DueAt: at(2026, 10, 13, 9, 0)},
-		}},
-		scans: map[int64]store.ScanStatus{1: okScan(testNow.Add(-4 * time.Hour))},
+		},
+			2: {
+				{ID: 20, ChildID: 2, Type: "event", Title: "9:00: 10ENGA - B2 - SMI", DueAt: at(2026, 10, 15, 9, 0)},
+			},
+		},
+		scans: map[int64]store.ScanStatus{1: okScan(testNow.Add(-4 * time.Hour)), 2: okScan(testNow.Add(-4 * time.Hour))},
 	}
 }
 
@@ -233,6 +237,72 @@ func TestEmptyQuestionCannotAnswer(t *testing.T) {
 	}
 }
 
+// TestChildNamedInQuestionResolvesThePerson covers the Hub's actual call shape:
+// the Hub sends `person` equal to the asker, so the child's name is only in the
+// question. The literal phase question must still answer.
+func TestChildNamedInQuestionResolvesThePerson(t *testing.T) {
+	a := testAnswerer(harryData())
+	resp := a.Answer(context.Background(), AskRequest{
+		Question: "what does Harry have on today at school?",
+		Asker:    "sam",
+		Person:   "sam", // what the Hub forwards today (person defaults to asker)
+		Source:   "console",
+	})
+	if resp.Answer == nil {
+		t.Fatalf("answer = nil, reason = %q", resp.Reason)
+	}
+	if resp.Data["child"] != "Harry" {
+		t.Errorf("data.child = %v, want Harry", resp.Data["child"])
+	}
+	if !strings.Contains(*resp.Answer, "school event") {
+		t.Errorf("answer = %q, want the lesson count", *resp.Answer)
+	}
+}
+
+// TestExplicitChildWinsOverQuestionName: a caller that names a child wins, even
+// if the question text mentions another one.
+func TestExplicitChildWinsOverQuestionName(t *testing.T) {
+	a := testAnswerer(harryData())
+	resp := a.Answer(context.Background(), AskRequest{
+		Question: "what does Harry have on today?",
+		Asker:    "sam",
+		Person:   "finn",
+	})
+	if resp.Answer == nil {
+		t.Fatalf("answer = nil, reason = %q", resp.Reason)
+	}
+	if resp.Data["child"] != "Finn" {
+		t.Errorf("data.child = %v, want Finn", resp.Data["child"])
+	}
+}
+
+// TestTwoChildrenNamedCannotAnswer: the contract answers for one person at
+// most, so an ambiguous question is refused rather than guessed.
+func TestTwoChildrenNamedCannotAnswer(t *testing.T) {
+	a := testAnswerer(harryData())
+	resp := a.Answer(context.Background(), AskRequest{
+		Question: "what do Harry and Finn have on today?",
+		Asker:    "sam",
+		Person:   "sam",
+	})
+	if resp.Answer != nil {
+		t.Fatalf("answer = %q, want nil for an ambiguous question", *resp.Answer)
+	}
+}
+
+// TestNameIsNotMatchedInsideAWord keeps the fallback to whole words.
+func TestNameIsNotMatchedInsideAWord(t *testing.T) {
+	a := testAnswerer(harryData())
+	resp := a.Answer(context.Background(), AskRequest{
+		Question: "what does harrysaurus have on today?",
+		Asker:    "sam",
+		Person:   "sam",
+	})
+	if resp.Answer != nil {
+		t.Fatalf("answer = %q, want nil (no whole-word child name)", *resp.Answer)
+	}
+}
+
 func TestCapabilitiesNameMatchesRouting(t *testing.T) {
 	caps := DefaultCapabilities()
 	if caps.Project != "compass_nhs" {