refactor(rollups): move WMY and cumulative readers

- src/lib/measurements/rollup-read-wmy.ts → src/lib/rollups/measurement-read-wmy.ts
- src/lib/measurements/rollup-read-cumulative.ts → src/lib/rollups/measurement-read-cumulative.ts
- co-located tests follow the source files
- cumulative module's sibling import of apple-health-mapping promoted to
  the @/lib alias since that mapping stays in src/lib/measurements/

Importers updated: 2 sites for WMY (health-score + summaries-slice),
zero external sites for cumulative (only co-located test reads it).

Pure relocation.

src/lib/analytics/health-score-fast-path.ts

@@ -45,7 +45,7 @@ import {
   probeRollupCoverage,
   type RollupCoverageMap,
 } from "@/lib/rollups/measurement-coverage";
-import { readBestGranularityRollups } from "@/lib/measurements/rollup-read-wmy";
+import { readBestGranularityRollups } from "@/lib/rollups/measurement-read-wmy";
 import { calculateCompliance } from "./compliance";
 import {
   computeHealthScore,

src/lib/analytics/summaries-slice.ts

@@ -68,7 +68,7 @@ import {
   aggregateWmyBuckets,
   readBestGranularityRollups,
   type RollupBucketRow,
-} from "@/lib/measurements/rollup-read-wmy";
+} from "@/lib/rollups/measurement-read-wmy";
 
 const DAY_MS = 24 * 60 * 60 * 1000;
 

src/lib/rollups/__tests__/measurement-read-cumulative.test.ts

@@ -25,7 +25,7 @@ import {
   isCumulativeType,
   readCumulativeDaySums,
   resolveBucketSum,
-} from "../rollup-read-cumulative";
+} from "../measurement-read-cumulative";
 
 beforeEach(() => {
   mocks.findMany.mockReset();

src/lib/rollups/__tests__/measurement-read-wmy.test.ts

@@ -41,7 +41,7 @@ import {
   readWeekRollups,
   readYearRollups,
   type RollupBucketRow,
-} from "../rollup-read-wmy";
+} from "../measurement-read-wmy";
 
 const { findMany } = mocks;
 

src/lib/rollups/measurement-read-cumulative.ts

@@ -30,7 +30,7 @@
  */
 import { prisma } from "@/lib/db";
 import type { MeasurementType } from "@/generated/prisma/client";
-import { CUMULATIVE_HK_TYPES } from "./apple-health-mapping";
+import { CUMULATIVE_HK_TYPES } from "@/lib/measurements/apple-health-mapping";
 
 /**
  * Cumulative measurement types the rollup `sum_value` column serves.