maven: long-term memory vector-store interface (task 7)

- New internal/memory/ package: Store interface, InMemoryStore (cosine sim)
- Tests: insert→search roundtrip, topK truncation, empty store, cosine edges
- Wire into voice: memStore on reactiveHandler, insert note embedding after WriteNote
- Memory Insert is best-effort, log-and-continue on error

Co-Authored-By: opencode <opencode@anthropic.com>

cmd/mavend/voice.go

@@ -51,10 +51,12 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"strconv"
 	"sync"
 	"time"
 
 	"github.com/kami/maven/internal/audio"
+	"github.com/kami/maven/internal/memory"
 	"github.com/kami/maven/internal/config"
 	"github.com/kami/maven/internal/delivery"
 	"github.com/kami/maven/internal/delivery/voicesink"
@@ -200,7 +202,10 @@ func wireVoice(cfg *config.Config, coreAPI ipc.CoreAPI, phr phraser.Phraser) (*v
 	// ----- voice sink (proactive nudges: dispatcher → voicesink → tts → push to client) -----
 	w.voiceSink = voicesink.New(synthesizer, sessions)
 
-	// ----- the handler (the reactive path; closes over stt / tts / router / coreAPI) -----
+	// ----- memory (long-term vector storage, in-memory for now) -----
+	memStore := memory.NewInMemoryStore()
+
+	// ----- the handler (the reactive path; closes over stt / tts / router / coreAPI / memory) -----
 	h := &reactiveHandler{
 		stt:              transcriber,
 		tts:              synthesizer,
@@ -213,6 +218,7 @@ func wireVoice(cfg *config.Config, coreAPI ipc.CoreAPI, phr phraser.Phraser) (*v
 		now:              time.Now,
 		weatherProvider:  weatherProvider,
 		weatherLocation:  weatherLocation,
+		memStore:         memStore,
 	}
 
 	// ----- the server (TCP listener) -----
@@ -244,6 +250,8 @@ type reactiveHandler struct {
 	weatherProvider weather.Provider
 	weatherLocation string // default location for weather queries
 
+	memStore memory.Store
+
 	// pending destructive-act confirmation. A destructive act replies with a
 	// "выполнить X? да/нет" prompt and parks here; the NEXT utterance is read as
 	// the y/n answer. ponytail: single slot, single-user box — a second act
@@ -422,10 +430,19 @@ func (h *reactiveHandler) applyAction(ctx context.Context, dec router.Decision)
 			log.Printf("voice: embed note: %v", err)
 			return "не получилось сохранить заметку."
 		}
-		if _, err := h.api.WriteNote(ctx, h.now(), dec.Utterance, vec, "tap:voice"); err != nil {
+		noteID, err := h.api.WriteNote(ctx, h.now(), 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)
+		if h.memStore != nil {
+			if err := h.memStore.Insert(ctx, strconv.FormatInt(noteID, 10), vec, map[string]string{
+				"source": "voice",
+			}); err != nil {
+				log.Printf("voice: memory insert: %v", err)
+			}
+		}
 		return "" // replier phrases the "saved" reply
 
 	case router.IntentQuery: