mavend: group the recall fields into one wiring struct (V-433)

The review comment asked for basic DI. The answer is the idiom voice.go
already had for capabilities — a cohesive *Wiring struct — applied to a
group that is not a capability toggle, plus the decision written down so
it is a rule and not a habit.

recallWiring holds the embedder, the vector store, the personal boundary
and the two numbers that gate an answer. They sat in three places on
reactiveHandler, with the gate numbers a hundred lines from the store
they gate. Its zero value means no recall, so it is a value, not a
pointer like the optional-capability groups.

dataStore stays out of it. patterns.go, ecosystem_acts.go and confirm.go
use it, so it is not part of this cluster.

docs/handler-wiring.md records the choice, rejects a container or a
wire-style generator outright, defers narrow per-handler interfaces to
the package split that would justify them, and states the constraint the
task named: a wiring change does not ride a feature PR.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavend/actions_note.go

@@ -20,7 +20,7 @@ func (h *reactiveHandler) actionNote(ctx context.Context, dec router.Decision) s
 	// embed the note text with the same model the classifier uses, persist
 	// via CoreAPI (source=tap:voice). Semantic recall lives in `notes`, not
 	// facts — no predicate reads it (spec's two-memory split).
-	vec, err := router.EmbedPassage(ctx, h.embedder, dec.Utterance)
+	vec, err := router.EmbedPassage(ctx, h.recall.embedder, dec.Utterance)
 	if err != nil {
 		log.Printf("voice: embed note: %v", err)
 		return "не получилось сохранить заметку."
@@ -33,8 +33,8 @@ func (h *reactiveHandler) actionNote(ctx context.Context, dec router.Decision) s
 	}
 	// Insert into long-term memory (best-effort, must not fail the note write).
 	// text/ts in the meta make a Search hit self-describing (see bestRecall).
-	if h.memStore != nil {
-		if err := h.memStore.Insert(ctx, "note:"+strconv.FormatInt(noteID, 10), vec, map[string]string{
+	if h.recall.memStore != nil {
+		if err := h.recall.memStore.Insert(ctx, "note:"+strconv.FormatInt(noteID, 10), vec, map[string]string{
 			"source": "voice",
 			"type":   "note",
 			"text":   dec.Utterance,