phraser, mavend: read the fallbacks from the file (V-501)

The accessors are functions now, so the call sites that compared against one
literal compare against the entry instead: IsUnknownFallback and
IsSourcesFallback in the daemon tests, the entry key in the phraser tests. A
reworded variant no longer breaks a Go test.

The eval scores every variant on the persona checks the nudges already pass.

cmd/mavend/actions.go

@@ -66,7 +66,7 @@ func (h *reactiveHandler) actionChat(ctx context.Context, dec router.Decision) s
 		log.Printf("voice: chat: %v", err)
 	}
 	if reply == "" {
-		return phraser.ChatFallback
+		return phraser.ChatFallback()
 	}
 	return reply
 }

cmd/mavend/actions_query.go

@@ -798,7 +798,7 @@ func (h *reactiveHandler) queryGeneral(ctx context.Context, t *queryTurn) (strin
 	reply, err := h.phraseWorld(ctx, t.dec.Utterance, nil)
 	if errors.Is(err, phraser.ErrNoWorldModel) {
 		log.Printf("voice: %q needs the world model and it is not available", t.dec.Utterance)
-		return worldGap, true
+		return worldGap(), true
 	}
 	if err != nil || reply == "" {
 		return "не знаю.", true

cmd/mavend/query_recall_test.go

@@ -121,8 +121,8 @@ func TestQueryRecallNoteCanWin(t *testing.T) {
 			{text: "выучил пару аккордов", score: 0.50, kind: "note"},
 		})
 		reply := askQuery(t, h, q)
-		if want := "вот что я нашла: молоко стоит в холодильнике"; reply != want {
-			t.Errorf("reply %q, want %q", reply, want)
+		if !phraser.IsSourcesFallback(reply, "молоко стоит в холодильнике") {
+			t.Errorf("reply %q, want the note read back", reply)
 		}
 		// One text, the winning memory's — the answer came from the memory
 		// pass, not from handing the phraser every note in the table.
@@ -151,7 +151,7 @@ func TestQueryRecallNoteCanWin(t *testing.T) {
 			{text: "молоко стоит в холодильнике", score: 0.860, kind: "note"},
 			{text: "молоко закончилось", score: 0.858, kind: "note"},
 		})
-		if reply := askQuery(t, h, q); reply != "не знаю." {
+		if reply := askQuery(t, h, q); !phraser.IsUnknownFallback(reply) {
 			t.Errorf("reply %q, want silence", reply)
 		}
 	})

cmd/mavend/worldmodel.go

@@ -23,7 +23,11 @@ type worldPhraser interface {
 // question about his meeting came back as a swimming competition in Nottingham.
 // Naming the gap is the rule CLAUDE.md already applies to a sibling service
 // being down.
-const worldGap = "сейчас не могу ответить — большая модель недоступна, а придумывать не хочу."
+//
+// The wording lives in fallbacks_ru_v1.json and is fixed there, not picked from
+// variants: this sentence names one specific gap and must not drift into a
+// general "I don't know".
+func worldGap() string { return phraser.WorldGap() }
 
 // phraseWorld asks the world model, or reports the gap.
 //

cmd/mavend/worldmodel_test.go

@@ -35,7 +35,7 @@ func TestQueryGeneralNamesTheGap(t *testing.T) {
 	if !ok {
 		t.Fatal("queryGeneral passed on the last source in the chain")
 	}
-	if reply != worldGap {
+	if reply != worldGap() {
 		t.Fatalf("reply = %q, want the named gap", reply)
 	}
 	if g.worldCalls != 1 {
@@ -51,7 +51,7 @@ func TestQueryGeneralWithoutAWorldModelIsUnchanged(t *testing.T) {
 	if !ok {
 		t.Fatal("queryGeneral passed on the last source in the chain")
 	}
-	if reply != "не знаю." {
+	if !phraser.IsUnknownFallback(reply) {
 		t.Fatalf("reply = %q, want the Stub's answer", reply)
 	}
 }
@@ -61,12 +61,12 @@ func TestQueryGeneralWithoutAWorldModelIsUnchanged(t *testing.T) {
 // English in it.
 func TestWorldGapIsInPersona(t *testing.T) {
 	for _, bad := range []string{"вы", "ваш", "рад ", "дорогой", "милый"} {
-		if strings.Contains(worldGap, bad) {
-			t.Errorf("the gap phrase contains %q: %s", bad, worldGap)
+		if strings.Contains(worldGap(), bad) {
+			t.Errorf("the gap phrase contains %q: %s", bad, worldGap())
 		}
 	}
-	if strings.ContainsAny(worldGap, "abcdefghijklmnopqrstuvwxyz") {
-		t.Errorf("the gap phrase has Latin letters in it: %s", worldGap)
+	if strings.ContainsAny(worldGap(), "abcdefghijklmnopqrstuvwxyz") {
+		t.Errorf("the gap phrase has Latin letters in it: %s", worldGap())
 	}
 }
 

internal/phraser/eval/fallbacks_test.go

@@ -0,0 +1,40 @@
+package eval
+
+import (
+	"math/rand"
+	"strings"
+	"testing"
+
+	"github.com/kami/maven/internal/phraser"
+)
+
+// TestFallbackPersona scores every line in fallbacks_ru_v1.json on the persona
+// checks the nudges are already held to. These lines are heard out loud, and
+// they live in a JSON file now, so a reworded variant that says "рад" or "вы"
+// would otherwise reach him with nothing between it and the speaker.
+//
+// Only the persona checks run. Mood and topic belong to a nudge, and these are
+// not nudges: they are what she says when there is no answer.
+func TestFallbackPersona(t *testing.T) {
+	fb, err := phraser.LoadFallbacks(rand.NewSource(20260804))
+	if err != nil {
+		t.Fatalf("LoadFallbacks: %v", err)
+	}
+	persona := map[string]bool{
+		CheckLang: true, CheckFeminine: true, CheckHisGender: true,
+		CheckAddress: true, CheckCringe: true, CheckLength: true,
+	}
+	variants := fb.Variants()
+	if len(variants) == 0 {
+		t.Fatal("no variants — the file loaded empty")
+	}
+	for _, v := range variants {
+		// {sources} stands for his own notes and never carries persona of its own.
+		body := strings.ReplaceAll(v, "{sources}", "два литра")
+		for _, r := range RunChecks(Case{}, body, "neutral") {
+			if persona[r.Name] && !r.Pass {
+				t.Errorf("%q fails %s: %s", v, r.Name, r.Detail)
+			}
+		}
+	}
+}

internal/phraser/failure_test.go

@@ -8,12 +8,28 @@ import (
 	"testing"
 )
 
+// isFallback — the text she says is picked from that entry's variants, so a test
+// pins the entry rather than the wording. Pinning one line would make editing
+// fallbacks_ru_v1.json break Go tests, which is the coupling this file removed.
+func isFallback(t *testing.T, key, sources, got string) bool {
+	t.Helper()
+	e, ok := DefaultFallbacks().file.Entries[key]
+	if !ok {
+		t.Fatalf("no fallback entry %q", key)
+	}
+	for _, v := range e.Variants {
+		if strings.ReplaceAll(v, "{sources}", sources) == got {
+			return true
+		}
+	}
+	return false
+}
+
 // A dead server must be distinguishable from bad phrasing. Both PhraseChat and
-// PhraseQuery keep the turn alive with canned text — ChatFallback, "не знаю.",
-// "вот что я нашла: …" — and every one of those is also a legitimate reply, so
-// the text alone cannot say which happened. The error is the only signal, and
-// before Vikunja #397 it was dropped: the talk scorer reported a full run with
-// zero errors off a server that answered nothing.
+// PhraseQuery keep the turn alive with canned text — and every one of those
+// lines is also a legitimate reply, so the text alone cannot say which happened.
+// The error is the only signal, and before Vikunja #397 it was dropped: the talk
+// scorer reported a full run with zero errors off a server that answered nothing.
 func TestPhrasingReportsTheFailureWithTheFallback(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "model not loaded", http.StatusServiceUnavailable)
@@ -22,19 +38,20 @@ func TestPhrasingReportsTheFailureWithTheFallback(t *testing.T) {
 	p := NewLLMPhraserAt(srv.URL, Config{})
 
 	cases := []struct {
-		name string
-		call func() (string, error)
-		want string
+		name    string
+		call    func() (string, error)
+		key     string
+		sources string
 	}{
 		{"chat", func() (string, error) {
 			return p.PhraseChat(context.Background(), "как дела", nil)
-		}, ChatFallback},
+		}, fbChat, ""},
 		{"knowledge", func() (string, error) {
 			return p.PhraseQuery(context.Background(), "кто написал войну и мир", nil)
-		}, "не знаю."},
+		}, fbQueryUnknown, ""},
 		{"evidence", func() (string, error) {
 			return p.PhraseQuery(context.Background(), "сколько воды я выпил", []string{"два литра"})
-		}, "вот что я нашла: два литра"},
+		}, fbQuerySources, "два литра"},
 	}
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {
@@ -42,8 +59,8 @@ func TestPhrasingReportsTheFailureWithTheFallback(t *testing.T) {
 			if err == nil {
 				t.Fatalf("no error from a dead server; the scorer would count this as bad phrasing")
 			}
-			if got != c.want {
-				t.Errorf("fallback text = %q, want %q — the daemon still has to say something", got, c.want)
+			if !isFallback(t, c.key, c.sources, got) {
+				t.Errorf("fallback text = %q, want a %q variant — the daemon still has to say something", got, c.key)
 			}
 		})
 	}
@@ -63,8 +80,8 @@ func TestEmptyKnowledgeAnswerIsAnError(t *testing.T) {
 	if err == nil {
 		t.Fatal("an empty response scored as an answer")
 	}
-	if got != "не знаю." {
-		t.Errorf("fallback text = %q, want \"не знаю.\"", got)
+	if !isFallback(t, fbQueryUnknown, "", got) {
+		t.Errorf("fallback text = %q, want a %q variant", got, fbQueryUnknown)
 	}
 	if !strings.Contains(err.Error(), "empty") {
 		t.Errorf("error = %v; want it to name the empty response", err)

internal/phraser/fallbacks_test.go

@@ -0,0 +1,57 @@
+package phraser
+
+import (
+	"math/rand"
+	"strings"
+	"testing"
+)
+
+// The embedded file must load, or the daemon speaks from hardFloor and nobody
+// finds out until he hears the wrong words.
+func TestFallbacksLoad(t *testing.T) {
+	fb, err := LoadFallbacks(rand.NewSource(1))
+	if err != nil {
+		t.Fatalf("LoadFallbacks: %v", err)
+	}
+	if got := fb.FromSources("два литра"); !strings.Contains(got, "два литра") {
+		t.Errorf("FromSources = %q, want the sources in it", got)
+	}
+	if fb.WorldGap() != hardFloor[fbWorldGap] {
+		t.Errorf("WorldGap = %q, want the fixed wording %q", fb.WorldGap(), hardFloor[fbWorldGap])
+	}
+}
+
+// A broken or missing file must not take her last words away: every accessor
+// answers from the literal it replaced.
+func TestNilFallbacksAnswerFromTheHardFloor(t *testing.T) {
+	var fb *Fallbacks
+	if got := fb.Chat(); got != hardFloor[fbChat] {
+		t.Errorf("Chat = %q, want %q", got, hardFloor[fbChat])
+	}
+	if got := fb.Unknown(); got != hardFloor[fbQueryUnknown] {
+		t.Errorf("Unknown = %q, want %q", got, hardFloor[fbQueryUnknown])
+	}
+	if got := fb.FromSources("два литра"); got != "вот что я нашла: два литра" {
+		t.Errorf("FromSources = %q", got)
+	}
+	if got := fb.WorldGap(); got != hardFloor[fbWorldGap] {
+		t.Errorf("WorldGap = %q", got)
+	}
+}
+
+// Hearing the identical words every time a request fails is how a failure stops
+// registering as one.
+func TestFallbacksDoNotRepeat(t *testing.T) {
+	fb, err := LoadFallbacks(rand.NewSource(7))
+	if err != nil {
+		t.Fatalf("LoadFallbacks: %v", err)
+	}
+	prev := fb.Chat()
+	for i := 0; i < 20; i++ {
+		got := fb.Chat()
+		if got == prev {
+			t.Fatalf("chat repeated %q on turn %d", got, i)
+		}
+		prev = got
+	}
+}

internal/phraser/llmphraser.go

@@ -449,14 +449,14 @@ func (p *LLMPhraser) PhraseQuery(ctx context.Context, utterance string, notes []
 		sys, prompt := p.knowledgePrompt(utterance)
 		resp, err := p.chatWithSystem(ctx, sys, prompt, 768)
 		if err != nil {
-			return "не знаю.", fmt.Errorf("phrase query (knowledge): %w", err)
+			return UnknownFallback(), fmt.Errorf("phrase query (knowledge): %w", err)
 		}
 		if resp == "" {
-			return "не знаю.", errEmptyResponse
+			return UnknownFallback(), errEmptyResponse
 		}
 		text, _, perr := parseResponseMood(resp)
 		if perr != nil {
-			return "не знаю.", fmt.Errorf("phrase query (knowledge): %w", perr)
+			return UnknownFallback(), fmt.Errorf("phrase query (knowledge): %w", perr)
 		}
 		if text != "" {
 			return text, nil
@@ -472,7 +472,7 @@ func (p *LLMPhraser) PhraseQuery(ctx context.Context, utterance string, notes []
 		if cause == nil {
 			cause = perr
 		}
-		return "вот что я нашла: " + strings.Join(notes, "; "),
+		return SourcesFallback(strings.Join(notes, "; ")),
 			fmt.Errorf("phrase query (evidence): %w", cause)
 	}
 	if text != "" {
@@ -501,11 +501,11 @@ func (p *LLMPhraser) PhraseChat(ctx context.Context, utterance string, history [
 
 	resp, err := p.chatWithMessages(ctx, msgs, 768)
 	if err != nil {
-		return ChatFallback, fmt.Errorf("phrase chat: %w", err)
+		return ChatFallback(), fmt.Errorf("phrase chat: %w", err)
 	}
 	text, _, perr := parseResponseMood(resp)
 	if perr != nil {
-		return ChatFallback, fmt.Errorf("phrase chat: %w", perr)
+		return ChatFallback(), fmt.Errorf("phrase chat: %w", perr)
 	}
 	if text != "" {
 		return text, nil

internal/phraser/phraser.go

@@ -66,28 +66,19 @@ type Stub struct{}
 // NewStub builds the floor phraser. no config — the Stub is stateless.
 func NewStub() *Stub { return &Stub{} }
 
-// ChatFallback — what she says on the chat path when the model gave her
-// nothing to say. It replaced "поговорили.", which reads as a summary of a
-// conversation that did not happen. Said out loud this one is an admission,
-// which is what it is.
-const ChatFallback = "даже не знаю, что сказать."
-
 // PhraseChat returns a stub reply — the LLMPhraser replaces this with a
 // prompted response from the model. The history parameter is accepted but
 // ignored at the stub level (the production impl uses it for multi-turn).
 func (s *Stub) PhraseChat(_ context.Context, _ string, _ []dialogue.Turn) (string, error) {
-	return ChatFallback, nil
+	return ChatFallback(), nil
 }
 
 // PhraseQuery returns a deterministic summary of the best matching notes.
 func (s *Stub) PhraseQuery(_ context.Context, _ string, notes []string) (string, error) {
 	if len(notes) == 0 {
-		return "не знаю.", nil
+		return UnknownFallback(), nil
 	}
-	if len(notes) == 1 {
-		return "вот что я нашла: " + notes[0], nil
-	}
-	return "вот что я нашла: " + strings.Join(notes, "; "), nil
+	return SourcesFallback(strings.Join(notes, "; ")), nil
 }
 
 // Close implements Phraser.Close (no-op for the stub).