fix: Sem. préc. HEAD→GET, prevMeetings cache, remove footer

- investinglive: tryUrl HEAD→GET + res.body?.cancel() (WordPress bloque HEAD)
  fenêtre recherche article préc. élargie 21→28 jours
- rateprobability: CBRatePath + prevMeetings/prevWeekDate, loadPrevWeekCachedBody()
  fetchAllCBPaths enrichit prevMeetings depuis snapshot GitHub Actions
- fetch-rate-data.mjs: rotation current→previousWeek (5–9 jours) pour Rate Curve
- CurrencyCard: rateCurveData préfère prevMeetings (exact/meeting) > ilDelta (approx)
  légende hasPrevCurve pilote affichage ligne bleue et label date
- page.tsx: suppression footer Sources/LLM, remplacement par pb-12

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

lib/investinglive.ts

@@ -52,12 +52,15 @@ async function tryUrl(daysAgo: number): Promise<ArticleRef | null> {
   const dateStr  = `${yyyymmdd.slice(0,4)}-${yyyymmdd.slice(4,6)}-${yyyymmdd.slice(6,8)}`;
   const url = `https://investinglive.com/news/how-have-interest-rate-expectations-changed-after-this-weeks-event-${yyyymmdd}/`;
   try {
+    // GET au lieu de HEAD — certains serveurs WordPress refusent HEAD (405/404 même si la page existe)
     const res = await fetch(url, {
-      method:  "HEAD",
+      method:  "GET",
       headers: { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/124.0.0.0 Safari/537.36" },
       cache:   "no-store",
     });
-    return res.ok ? { url, dateStr, daysAgo } : null;
+    if (!res.ok) return null;
+    await res.body?.cancel(); // libère la connexion sans télécharger le body
+    return { url, dateStr, daysAgo };
   } catch { return null; }
 }
 
@@ -73,8 +76,8 @@ async function findArticleRefs(): Promise<{ current: ArticleRef | null; previous
   if (!current) return { current: null, previous: null };
 
   let previous: ArticleRef | null = null;
-  // Start the day after the current article and look up to 21 days further back
-  for (let d = current.daysAgo + 1; d <= current.daysAgo + 21; d++) {
+  // Start the day after the current article and look up to 28 days further back
+  for (let d = current.daysAgo + 1; d <= current.daysAgo + 28; d++) {
     const found = await tryUrl(d);
     if (found) { previous = found; break; }
   }

lib/rateprobability.ts

@@ -44,6 +44,8 @@ export interface CBRatePath {
   yearEndImplied: number | null;           // taux impliqué à la dernière réunion connue (SOFR)
   ilCurrent?:     ILCurrent;               // valeurs absolues de l'article IL courant
   ilDelta?:       ILWeeklyDelta;           // delta vs article IL semaine précédente
+  prevMeetings?:  RateProbMeeting[];       // réunions semaine précédente (snapshot RP)
+  prevWeekDate?:  string;                  // date du snapshot semaine précédente
 }
 
 export type RateProbData = Partial<Record<Currency, CBRatePath>>;
@@ -244,6 +246,21 @@ function loadCachedRPBody(ccy: string, slug: string): Record<string, unknown> |
   } catch { return null; }
 }
 
+function loadPrevWeekCachedBody(ccy: string): { body: Record<string, unknown>; date: string } | null {
+  try {
+    const filePath = join(process.cwd(), "data", "rate-probabilities.json");
+    const raw = readFileSync(filePath, "utf8");
+    const parsed = JSON.parse(raw) as { previousWeek?: Record<string, unknown>; previousWeekFetchedAt?: string };
+    if (!parsed.previousWeek || !parsed.previousWeekFetchedAt) return null;
+    const entry = parsed.previousWeek[ccy] as Record<string, unknown> | undefined;
+    if (!entry) return null;
+    const ageMs = Date.now() - new Date(parsed.previousWeekFetchedAt).getTime();
+    // Le snapshot semaine précédente doit dater de 4 à 10 jours
+    if (ageMs < 3 * 86400000 || ageMs > 11 * 86400000) return null;
+    return { body: entry, date: parsed.previousWeekFetchedAt.slice(0, 10) };
+  } catch { return null; }
+}
+
 // Reparse un body brut de rateprobability.com (même format que fetchCBPath)
 function parseCBBody(ccy: Currency, body: Record<string, unknown>): CBRatePath | null {
   const today = body["today"] as Record<string, unknown> | undefined;
@@ -301,6 +318,18 @@ export async function fetchAllCBPaths(): Promise<RateProbData> {
     }
   }
 
+  // Enrichissement prevMeetings depuis snapshot semaine précédente (GitHub Actions)
+  for (const [ccy] of CB_KEYS) {
+    const path = data[ccy as Currency];
+    if (!path) continue;
+    const prev = loadPrevWeekCachedBody(ccy);
+    if (!prev) continue;
+    const prevPath = parseCBBody(ccy as Currency, prev.body);
+    if (prevPath?.meetings.length) {
+      data[ccy as Currency] = { ...path, prevMeetings: prevPath.meetings, prevWeekDate: prev.date };
+    }
+  }
+
   // CHF/SNB : rateprobability ne couvre pas la SNB → InvestingLive est la seule source
   if (!data["CHF"] && ilData["CHF"]) {
     const snbPath = buildSNBPath(ilData, 0.00); // taux actuel SNB = 0%