feat(coach): extend the snapshot window enum with lastYear

Adds a year-in-review window between last90days and allTime so the
Coach drawer can ground a long-horizon question (seasonal mood
patterns, year-over-year weight trajectory) without falling back to
the unbounded `allTime` window. The new enum value flows through the
scope schema, the snapshot builder's window-to-day-count mapping,
the provenance window-set seeding so the source-chips render the
year-in-review chip, and the Coach source-chips Record.

Extends the snapshot test with a `lastYear`-specific assertion that
pins the scope window and the provenance envelope.

src/components/insights/coach-panel/source-chips.tsx

@@ -51,6 +51,10 @@ const WINDOW_KEYS: Record<CoachProvenance["windows"][number], string> = {
   last7days: "insights.coach.window.last7days",
   last30days: "insights.coach.window.last30days",
   last90days: "insights.coach.window.last90days",
+  // v1.4.27 B7 / BL-P6-4 — year-in-review window. The i18n key
+  // resolves to a localised label; absent translations fall back
+  // through the resolver to the English source.
+  lastYear: "insights.coach.window.lastYear",
   allTime: "insights.coach.window.allTime",
 };
 

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

@@ -132,6 +132,24 @@ describe("buildCoachSnapshot", () => {
     expect(parsed.pulse.timeline.recent.length).toBe(1);
   });
 
+  it("respects the scope.window — lastYear flags the year-in-review window", async () => {
+    featuresMock.mockResolvedValue({
+      bloodPressure: { avg30Sys: 124, coverage: { count: 50 } },
+    });
+    prismaMock.measurement.findMany.mockResolvedValue([
+      daysAgo(120, 124, "BLOOD_PRESSURE_SYS"),
+      daysAgo(120, 81, "BLOOD_PRESSURE_DIA"),
+    ]);
+
+    const out = await buildCoachSnapshot("user-1", {
+      sources: ["bp"],
+      window: "lastYear",
+    });
+    const parsed = JSON.parse(out.snapshotJson);
+    expect(parsed.scope.window).toBe("lastYear");
+    expect(out.provenance.windows).toContain("lastYear");
+  });
+
   it("defaults to all-source last30days when no scope is provided", async () => {
     const out = await buildCoachSnapshot("user-1");
     const parsed = JSON.parse(out.snapshotJson);

src/lib/ai/coach/snapshot.ts

@@ -69,6 +69,13 @@ function windowToDays(window: CoachScopeWindow): number {
       return 30;
     case "last90days":
       return 90;
+    case "lastYear":
+      // v1.4.27 B7 / BL-P6-4 — year-in-review window. Same 365-day
+      // ceiling as the historical `allTime` cap so the prompt budget
+      // stays bounded, but with explicit semantics — the Coach knows
+      // the user is asking about a long-horizon view rather than the
+      // unbounded "all time" backfill.
+      return 365;
     case "allTime":
       // Cap "allTime" at one year for the timeline. The aggregate
       // section already cites multi-year ranges via the features
@@ -331,6 +338,14 @@ export async function buildCoachSnapshot(
   // budget for free-tier accounts.
   const snapshot: Record<string, unknown> = {};
   const windows = new Set<CoachProvenance["windows"][number]>();
+  // v1.4.27 B7 / BL-P6-4 — seed the provenance window set with the
+  // user's resolved scope so the year-in-review window surfaces in the
+  // provenance envelope even when the per-metric branches below only
+  // emit `last30days` / `last90days` chips. Older windows are added
+  // by the metric branches as before.
+  if (window === "lastYear" || window === "allTime") {
+    windows.add(window);
+  }
   const metrics = new Set<CoachProvenance["metrics"][number]>();
   const counts: NonNullable<CoachProvenance["counts"]> = {};
 

src/lib/ai/coach/types.ts

@@ -41,6 +41,11 @@ export const coachScopeWindowSchema = z.enum([
   "last7days",
   "last30days",
   "last90days",
+  // v1.4.27 B7 / BL-P6-4 — long-horizon window for the year-in-review
+  // surfaces. Sits between `last90days` and `allTime` so the snapshot
+  // builder can sample a denser timeline (one row per week) than the
+  // unbounded fallback while still surfacing seasonal patterns.
+  "lastYear",
   "allTime",
 ]);
 
@@ -145,7 +150,9 @@ export interface CoachProvenance {
    * Time windows the assistant drew on. Same enum the strict insight
    * schema uses elsewhere so the UI can pin a mini-chart to the chip.
    */
-  windows: ReadonlyArray<"last7days" | "last30days" | "last90days" | "allTime">;
+  windows: ReadonlyArray<
+    "last7days" | "last30days" | "last90days" | "lastYear" | "allTime"
+  >;
   /**
    * Metric topics referenced. Stable contract keys — translated by the
    * UI, never by the server.