feat: {response,mood} output contract + router removal, TTS piper plan

Daemon side of Decision B: parse {"response","mood"} across the 4 consumers
(replier, nudges, reminders, chat), fall back to legacy formats. Drop the
LLM router — the classifier handles routing; replier/phraser share one
llm.Client (timeout 20s->60s). llm.Client reads reasoning_content when
content is empty (thinking models).

Docs: TTS piper-student plan (OmniVoice teacher -> piper student, from
scratch, phoneme-first). CLAUDE.md training guide.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/delivery/dispatcher.go

@@ -37,6 +37,7 @@ type PhrasedNudge struct {
 	Candidate loop.Candidate
 	Body      string
 	Summary   string
+	Mood      string
 }
 
 // PhrasedReminder — the phraser's output for a reminder.
@@ -44,6 +45,7 @@ type PhrasedReminder struct {
 	Decision loop.ReminderDecision
 	Body     string
 	Summary  string
+	Mood     string
 }
 
 // Dispatch — record of one successful send. returned to the daemon for