morning, tasks, memory: say the summaries from the file (V-506)

The three callers now read their sentences out of summary_ru_v1.json: the
plan lines in morning.Plan.FormatRU, the list and reason words in
tasks.FormatRU, and the habit readouts in memory.Profile.

Two behaviour_test assertions moved from substring to say.IsS, because the
habit gaps have variants now and a substring pins one of them. The
"по {day} у тебя обычно" variant was dropped on sight: the activities are
verbs, so it read "у тебя обычно тренируешься".

The persona scorer covers the family, and a new test asserts every gap
variant still says she has not seen enough rather than that he has nothing.

internal/say/summary_ru_v1.json

@@ -78,7 +78,8 @@
     },
 
     "habit_weekday": {
-      "variants": ["по {day} ты обычно {items}.", "по {day} у тебя обычно {items}."]
+      "fixed": true,
+      "variants": ["по {day} ты обычно {items}."]
     },
     "habit_weekday_same": {
       "variants": [
@@ -89,7 +90,7 @@
     "habit_weekday_none": {
       "variants": [
         "по {day} я пока не вижу у тебя ничего постоянного.",
-        "по {day} я пока не набрала записей, чтобы говорить о постоянном."
+        "по {day} у тебя пока ничего постоянного не вижу — записей мало."
       ]
     },
     "habit_weekend_both": {
@@ -110,7 +111,7 @@
     "habit_weekend_none": {
       "variants": [
         "по выходным я пока не вижу у тебя ничего постоянного.",
-        "по выходным я пока не набрала записей, чтобы говорить о постоянном."
+        "по выходным у тебя пока ничего постоянного не вижу — записей мало."
       ]
     },
     "habit_overall": {

internal/say/summary_test.go

@@ -0,0 +1,49 @@
+package say
+
+import (
+	"math/rand"
+	"strings"
+	"testing"
+)
+
+// The file has to load, and every key the code names has to be in it.
+func TestSummariesLoad(t *testing.T) {
+	s, err := LoadSummaries(rand.NewSource(1))
+	if err != nil {
+		t.Fatalf("load: %v", err)
+	}
+	for _, key := range summaryKeys {
+		if got := s.Say(key, nil); got == "" {
+			t.Errorf("%s says nothing", key)
+		}
+	}
+}
+
+// A nil *Summaries is the unloadable-file case, and it must still speak. The
+// habit sentences are the ones that matter here: falling back must not turn
+// "I have not seen enough" into silence.
+func TestNilSummariesAnswerFromTheFloor(t *testing.T) {
+	var s *Summaries
+	if got, want := s.Say(HabitOverallNone, nil), summaryFloor[HabitOverallNone]; got != want {
+		t.Errorf("got %q, want %q", got, want)
+	}
+	if got := s.Say(PlanDay, map[string]string{"date": "03.08.2026", "items": "x"}); !strings.Contains(got, "03.08.2026") {
+		t.Errorf("the floor dropped the date: %q", got)
+	}
+}
+
+// The empty cases claim she has not seen enough, never that he has no habits.
+// Every variant has to hold that line, since the picker treats them as equals.
+func TestHabitGapsSaySheHasNotSeenEnough(t *testing.T) {
+	s, err := LoadSummaries(rand.NewSource(1))
+	if err != nil {
+		t.Fatalf("load: %v", err)
+	}
+	for _, key := range []string{HabitWeekdayNone, HabitWeekendNone, HabitOverallNone} {
+		for _, v := range s.d.file.Entries[key].Variants {
+			if !strings.Contains(v, "пока") && !strings.Contains(v, "ещё") {
+				t.Errorf("%s variant %q reads as a fact about him, not as a gap in her records", key, v)
+			}
+		}
+	}
+}