fix(rectification): share datedPrecision for quarter and range events

Training already counted quarter/range as dated, while the inference ledger mapped them to unknown and left the events unused.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/tests/rectification-credible-range-projection.test.ts

@@ -196,6 +196,24 @@ test("a corrupted receipt range outside the window still fail-closes", () => {
   assert.equal(projection.credibleRange, null);
 });
 
+test("quarter-precision evidence stays dated in the inference ledger", () => {
+  const state = buildCaseInferenceState({
+    range: { start_time: "05:00", end_time: "05:10" },
+    candidates: [
+      { candidateId: "05:00", time: "05:00", relativeSupport: 50 },
+      { candidateId: "05:10", time: "05:10", relativeSupport: 50 },
+    ],
+    evidence: [
+      { id: "q-career", domain: "career", occurredFrom: "2018-04-01", datePrecision: "quarter" },
+      { id: "y-edu", domain: "education", occurredFrom: "2016-01-01", datePrecision: "year" },
+    ],
+    probes: [],
+  });
+  const quarter = state.events.find((item) => item.id === "q-career");
+  assert.equal(quarter?.precision, "year");
+  assert.notEqual(quarter?.usage, "unused");
+});
+
 test("buildCaseInferenceState receipt is the producer of the projected range", () => {
   const state = buildCaseInferenceState({
     range: { start_time: "04:55", end_time: "05:02" },