Split actions.go into per-intent files

Pure move: actionFact, actionReminder, actionAct and actionNote each get
their own actions_<intent>.go. The two small ones (chat, system) and the
actionHandlers table stay in actions.go, which is now just the dispatch
layer and the notes about what does not belong in it. No behaviour
change — only the file a handler is read in.

cmd/mavend/actions_note.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"log"
+	"strconv"
+
+	"github.com/kami/maven/internal/router"
+)
+
+// actionNote handles router.IntentNote: embed the note, persist it, and
+// index it for recall.
+func (h *reactiveHandler) actionNote(ctx context.Context, dec router.Decision) string {
+	// 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)
+	if err != nil {
+		log.Printf("voice: embed note: %v", err)
+		return "не получилось сохранить заметку."
+	}
+	noteTs := h.now()
+	noteID, err := h.api.WriteNote(ctx, noteTs, dec.Utterance, vec, "tap:voice")
+	if err != nil {
+		log.Printf("voice: write note: %v", err)
+		return "не получилось сохранить заметку."
+	}
+	// 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{
+			"source": "voice",
+			"type":   "note",
+			"text":   dec.Utterance,
+			"ts":     strconv.FormatInt(noteTs.Unix(), 10),
+		}); err != nil {
+			log.Printf("voice: memory insert: %v", err)
+		}
+	}
+	return "" // replier phrases the "saved" reply
+}