Word nudges from templates by default, model optional

DEPRECATION, flagged not asked: LLM-phrased nudges are no longer the default.
LLMPhraser.PhraseNudge now returns a hand-written Russian template. The model
still phrases chat, queries and reminders — only nudges moved.

Why: measured over many runs, Qwen3.5-0.8B wrote formal "вы" and plural
imperatives, used masculine self-reference, and invented facts and units
(90-95 seconds to boil an egg). A nudge is five words of known content, so
generation buys nothing and risks the persona every time. Templates score
15/15 on the nudge fixture, the model 11-13/15.

Nothing is deleted: the prompt, the fallbacks and the whole LLM nudge path
stay. Set phraser.llm_nudges = true in deploy/mavend.json to get them back.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ

internal/phraser/llmphraser.go

@@ -31,6 +31,10 @@ type LLMPhraser struct {
 	cmd    *exec.Cmd
 	cancel context.CancelFunc
 	wg     sync.WaitGroup
+
+	// tmpl — the hand-written Russian nudges. Default path for nudges; see
+	// Config.LLMNudges. nil only if the template file failed to load.
+	tmpl *NudgeTemplates
 }
 
 type Config struct {
@@ -46,6 +50,19 @@ type Config struct {
 	// nil ⇒ no block, the prompts stand alone.
 	ContextBlock func() string
 
+	// LLMNudges puts the model back in charge of nudge wording.
+	//
+	// Off by default, and that is a deliberate deprecation of LLM-phrased
+	// nudges: hand-written templates (nudges_ru_v1.json) word every nudge now.
+	// A nudge has nothing to be creative about, and measured over many runs the
+	// 0.8B broke the persona (formal "вы", plural imperatives, masculine
+	// self-reference) and invented facts and units. Templates score 15/15 on the
+	// nudge fixture, the model 11-13/15.
+	//
+	// The LLM path is kept, not deleted: flip this on to get it back. Chat,
+	// query and reminder phrasing are untouched and still go through the model.
+	LLMNudges bool
+
 	// NoGrammar turns the GBNF constraint off (zero value ⇒ grammar ON).
 	// The escape hatch exists because the target resident model — the
 	// locally CPT'd Qwen3-1.7B — does not exist yet: if its chat template
@@ -71,6 +88,7 @@ func NewLLMPhraser(ctx context.Context, cfg Config) (*LLMPhraser, error) {
 		cfg:    cfg,
 		client: &http.Client{Timeout: cfg.Timeout},
 		cancel: cancel,
+		tmpl:   loadNudgeTemplates(),
 	}
 	if err := p.start(ctx); err != nil {
 		cancel()
@@ -92,9 +110,22 @@ func NewLLMPhraserAt(baseURL string, cfg Config) *LLMPhraser {
 		client: &http.Client{Timeout: cfg.Timeout},
 		port:   strings.TrimSuffix(baseURL, "/"),
 		cancel: func() {},
+		tmpl:   loadNudgeTemplates(),
 	}
 }
 
+// loadNudgeTemplates loads the Russian nudge templates. A broken template file
+// must not stop the daemon booting, so a failure logs and leaves the LLM path
+// in charge of nudges.
+func loadNudgeTemplates() *NudgeTemplates {
+	nt, err := NewNudgeTemplates(nil)
+	if err != nil {
+		log.Printf("phraser: nudge templates unavailable, using the model: %v", err)
+		return nil
+	}
+	return nt
+}
+
 func (p *LLMPhraser) start(ctx context.Context) error {
 	args := []string{
 		"-m", p.cfg.ModelPath,
@@ -185,6 +216,10 @@ func (p *LLMPhraser) Close() error {
 }
 
 func (p *LLMPhraser) PhraseNudge(ctx context.Context, c loop.Candidate) (delivery.PhrasedNudge, error) {
+	// Templates first — see Config.LLMNudges for why this is the default.
+	if !p.cfg.LLMNudges && p.tmpl != nil {
+		return p.tmpl.PhraseNudge(ctx, c)
+	}
 	prompt := buildNudgePrompt(c)
 	resp, err := p.chat(ctx, prompt)
 	if err != nil {