fix(recommender): remove Todoist fallback on orchestrator failure; add snooze exclusion

When fetchOrchestratorTip returned null (LiteLLM timeout, bad JSON, etc.)
the recommender silently fell back to randomPolicy, serving a raw Todoist
task with no rationale — explaining both reported symptoms.

- Remove randomPolicy/signalToCandidate; return 204 when orchestrator fails
  so the UI shows "All clear" instead of a confusing Todoist task
- Pass recent_tip through the stack (frontend → POST /recommend →
  fetchOrchestratorTip → ml/serving RecommendRequest → build_orchestrator_messages)
  so after snooze the LLM is instructed not to repeat the snoozed content

Fixes #122

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/app/tip/page.tsx

@@ -40,11 +40,11 @@ export default function TipPage() {
     }
   }, [state]);
 
-  const loadTip = useCallback(async () => {
+  const loadTip = useCallback(async (recentTip?: string) => {
     setVisible(false);
     setState('loading');
     try {
-      const rec = await getRecommendation();
+      const rec = await getRecommendation(recentTip);
       if (!rec) {
         setState('empty');
         return;
@@ -62,10 +62,11 @@ export default function TipPage() {
 
   const react = async (action: 'done' | 'dismiss' | 'snooze') => {
     if (!tip) return;
+    const snoozedContent = action === 'snooze' ? tip.content : undefined;
     setVisible(false);
     setState('done');
     await sendFeedback(tip.id, { action });
-    setTimeout(() => loadTip(), 700);
+    setTimeout(() => loadTip(snoozedContent), 700);
   };
 
   const onPointerDown = () => {

apps/web/src/lib/api.ts

@@ -23,9 +23,12 @@ export async function getSession() {
   return apiFetch<{ user: { id: string; email: string; name?: string; image?: string } | null }>('/auth/session');
 }
 
-export async function getRecommendation(): Promise<RecommendResponse | null> {
+export async function getRecommendation(recentTip?: string): Promise<RecommendResponse | null> {
   try {
-    return await apiFetch<RecommendResponse>('/recommend', { method: 'POST' });
+    return await apiFetch<RecommendResponse>('/recommend', {
+      method: 'POST',
+      body: JSON.stringify(recentTip ? { recent_tip: recentTip } : {}),
+    });
   } catch (e: any) {
     if (e.status === 204 || e.status === 422) return null;
     throw e;