docs(planning): record v1.4.20.1 hotfix wave

New `.planning/phase-v1421-hotfix-report.md` summarises the six
fixes (Daily Briefing regenerate · Coach day-level snapshot · Coach
prompt update · streaming-bubble dedup · drawer header · sources rail
scope picker), the test-count delta (2026 → 2036 unit), the
token-budget impact of the day-level snapshot (~190 → ~3000 tokens
per full-scope turn), and a recommendation to ship as a v1.4.20.1
hotfix.

STATE.md grows a Phase F section + status block tracking the six
commits on develop. Includes prettier polish across the touched
coach surfaces (sources-rail, drawer, message-thread, snapshot,
chat route).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/api/insights/chat/route.ts

@@ -143,12 +143,7 @@ async function handleChatRequest(request: NextRequest): Promise<Response> {
       { status: 422 },
     );
   }
-  const {
-    conversationId,
-    message,
-    locale: bodyLocale,
-    scope,
-  } = parsed.data;
+  const { conversationId, message, locale: bodyLocale, scope } = parsed.data;
 
   await enforceBudget(userId);
 

src/components/insights/coach-panel/__tests__/sources-rail.test.tsx

@@ -53,9 +53,8 @@ describe("<SourcesRail>", () => {
 
   it("renders a checkbox per row + a window selector trigger", () => {
     const html = render(<SourcesRail />);
-    const checkboxes = (
-      html.match(/data-slot="coach-sources-checkbox"/g) ?? []
-    ).length;
+    const checkboxes = (html.match(/data-slot="coach-sources-checkbox"/g) ?? [])
+      .length;
     expect(checkboxes).toBe(5);
     expect(html).toContain('data-slot="coach-sources-window-trigger"');
   });

src/components/insights/coach-panel/coach-drawer.tsx

@@ -258,10 +258,7 @@ export function CoachDrawer({
           }
           sourcesRail={
             sourcesRail ?? (
-              <SourcesRail
-                scope={scope}
-                onScopeChange={setScope}
-              />
+              <SourcesRail scope={scope} onScopeChange={setScope} />
             )
           }
           thread={

src/components/insights/coach-panel/message-thread.tsx

@@ -67,9 +67,7 @@ export function MessageThread({
     messages.some((m) => m.id === streaming.messageId);
   const streamingActive =
     !streamingPersisted &&
-    (!!streaming?.inProgress ||
-      !!streaming?.content ||
-      !!streaming?.errorCode);
+    (!!streaming?.inProgress || !!streaming?.content || !!streaming?.errorCode);
 
   // Track scroll position so we don't yank the viewport when the user
   // is browsing earlier turns.

src/components/insights/coach-panel/sources-rail.tsx

@@ -82,7 +82,10 @@ export interface SourcesRailProps {
    * the controls still render but stay read-only — keeps the legend
    * surface stable for callers that don't yet wire scope through.
    */
-  onScopeChange?: (next: { sources: CoachScopeSource[]; window: CoachScopeWindow }) => void;
+  onScopeChange?: (next: {
+    sources: CoachScopeSource[];
+    window: CoachScopeWindow;
+  }) => void;
 }
 
 interface SourceRow {

src/lib/ai/coach/__tests__/snapshot.test.ts

@@ -27,7 +27,11 @@ const featuresMock = extractFeatures as unknown as ReturnType<typeof vi.fn>;
 /**
  * Helper: produce a measurement row N days before "now" at 09:00 UTC.
  */
-function daysAgo(n: number, value: number, type: string): {
+function daysAgo(
+  n: number,
+  value: number,
+  type: string,
+): {
   type: string;
   value: number;
   measuredAt: Date;

src/lib/ai/coach/snapshot.ts

@@ -53,15 +53,7 @@ const DEFAULT_SOURCES: ReadonlyArray<CoachScopeSource> = [
   "compliance",
 ];
 
-const WEEKDAY_KEYS = [
-  "Sun",
-  "Mon",
-  "Tue",
-  "Wed",
-  "Thu",
-  "Fri",
-  "Sat",
-] as const;
+const WEEKDAY_KEYS = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"] as const;
 
 function windowToDays(window: CoachScopeWindow): number {
   switch (window) {
@@ -163,7 +155,9 @@ function bucketWeekly(
   return Array.from(grouped.entries())
     .map(([weekISO, values]) => ({
       weekISO,
-      mean: Math.round((values.reduce((s, v) => s + v, 0) / values.length) * 10) / 10,
+      mean:
+        Math.round((values.reduce((s, v) => s + v, 0) / values.length) * 10) /
+        10,
       count: values.length,
     }))
     .sort((a, b) => a.weekISO.localeCompare(b.weekISO));
@@ -177,8 +171,7 @@ function buildDailyValueRows(
   const grouped = dailyMeans(recent);
   return Array.from(grouped.entries())
     .map(([date, info]) => {
-      const mean =
-        info.values.reduce((s, v) => s + v, 0) / info.values.length;
+      const mean = info.values.reduce((s, v) => s + v, 0) / info.values.length;
       return {
         date,
         weekday: utcWeekday(info.date),
@@ -206,10 +199,8 @@ function buildDailyBpRows(
   for (const [day, info] of sysByDay) {
     const dia = diaByDay.get(day);
     if (!dia) continue;
-    const sysMean =
-      info.values.reduce((s, v) => s + v, 0) / info.values.length;
-    const diaMean =
-      dia.values.reduce((s, v) => s + v, 0) / dia.values.length;
+    const sysMean = info.values.reduce((s, v) => s + v, 0) / info.values.length;
+    const diaMean = dia.values.reduce((s, v) => s + v, 0) / dia.values.length;
     out.push({
       date: day,
       weekday: utcWeekday(info.date),
@@ -310,10 +301,12 @@ export async function buildCoachSnapshot(
       : [];
 
   const byType = (t: string) =>
-    measurementRows.filter((r) => r.type === t).map((r) => ({
-      measuredAt: r.measuredAt,
-      value: r.value,
-    }));
+    measurementRows
+      .filter((r) => r.type === t)
+      .map((r) => ({
+        measuredAt: r.measuredAt,
+        value: r.value,
+      }));
 
   if (wantsBp && features.bloodPressure) {
     const sysRows = byType("BLOOD_PRESSURE_SYS");
@@ -405,9 +398,7 @@ export async function buildCoachSnapshot(
       // Per-day adherence rate within the recent window. Older days
       // collapse into a single weekly bucket.
       const recent = intakeRows.filter((r) => r.scheduledFor >= recentCutoff);
-      const olderRows = intakeRows.filter(
-        (r) => r.scheduledFor < recentCutoff,
-      );
+      const olderRows = intakeRows.filter((r) => r.scheduledFor < recentCutoff);
       const recentByDay = new Map<
         string,
         { date: Date; total: number; taken: number }