Move the quiet-toggle and pattern-extraction slices out of voice.go (#321)

Continues the decomposition PR #50 started. voice.go 542 -> 365:

  quiet_toggle.go  144  resolveQuietToggle, quietInflections, quietStem,
                        quietTokens, quietPhrase, quietOn/OffPhrases,
                        classifyQuietToggle  (quiet_toggle_test.go already
                        existed for these)
  patterns.go     +44  detectPattern, next to detectAndPropose which it calls
                        and which patterns.go's own header already pointed at

What is left in voice.go is the handler: reactiveHandler, HandlePushToTalk,
handleText, runTurn, applyAction, replySystem, chatHistory, reply.

Move-only: all 133 distinct non-blank lines removed from voice.go were
matched in the two destination files, zero lines added to voice.go. The only
non-move edits are import lists (log added to patterns.go, unicode and
internal/pattern dropped from voice.go) and two comments that pointed at
voice.go for code that is no longer there.

cmd/mavend/patterns.go

@@ -1,6 +1,6 @@
 // mavend/patterns.go — the shared detect+propose step of pattern inference
 // (Vikunja #43). Event *extraction* (fact -> action/object) happens at fact-
-// write time in voice.go's detectPattern, tied to whichever channel wrote the
+// write time in detectPattern below, tied to whichever channel wrote the
 // fact. Detection — turning a run of events into a proposed routine — is
 // channel-agnostic: it only needs what's already in the events table, so it
 // runs both right after a voice fact-write (for the immediate "напоминать?"
@@ -13,6 +13,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log"
 	"time"
 
 	"github.com/kami/maven/internal/pattern"
@@ -72,3 +73,48 @@ func detectAndPropose(ctx context.Context, ds *store.Store, action, object strin
 	}
 	return r, id, nil
 }
+
+// detectPattern extracts an event from the written fact and runs the pattern
+// detector. If a stable recurring pattern is found and no proposed routine
+// exists for this action+object yet, one is created and the user is prompted
+// to confirm via the park() mechanism. Returns the suggestion phrase when a
+// new proposal was created and parked; "" otherwise.
+func (h *reactiveHandler) detectPattern(ctx context.Context, factID int64, key, value string, ts time.Time) string {
+	ev := pattern.Extract(factID, key, value, ts)
+	if ev == nil {
+		return "" // not an actionable event
+	}
+	if _, err := h.dataStore.CreateEvent(ctx, factID, ev.Action, ev.Object, ts); err != nil {
+		log.Printf("voice: create event: %v", err)
+		return ""
+	}
+	// Detect+propose (Vikunja #43) is shared with the digestion tick's
+	// proactive scan — see detectAndPropose above. Event *extraction* stays
+	// here, tied to this fact write; detection over the accumulated history does
+	// not need to happen right now for the voice path to have already done
+	// its job — it's dedupe-safe to also let the next tick find the same
+	// pattern independently.
+	r, id, err := detectAndPropose(ctx, h.dataStore, ev.Action, ev.Object, ts)
+	if err != nil {
+		log.Printf("voice: detect pattern %s/%s: %v", ev.Action, ev.Object, err)
+		return ""
+	}
+	if r == nil {
+		return "" // not enough data, too irregular, or already proposed/decided
+	}
+	log.Printf("voice: proposed routine: %s/%s every %.1f days", r.Action, r.Object, r.IntervalDays)
+
+	// Park the proposal for voice confirmation.
+	phrase := pattern.PhraseRoutine(r)
+	h.mu.Lock()
+	h.pendingRoutine = &pendingRoutineConfirm{
+		routineID: id,
+		action:    r.Action,
+		object:    r.Object,
+		interval:  r.IntervalDays,
+		phrase:    phrase,
+		expiry:    ts.Add(confirmTTL),
+	}
+	h.mu.Unlock()
+	return phrase
+}