fix(report): accept section: job progress phases on read-back

Heartbeat and GET were parsing progress_phase with a pattern that rejects the colon prefix the writer already persists, which aborted generation after the first chapter.

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

frontend/tests/personal-report-job-service.test.ts

@@ -479,6 +479,23 @@ test("claim and heartbeat require the exact live lease token", async () => {
   });
   assert.equal(progressed.progressPhase, "building_evidence");
   assert.equal(progressed.progressPercent, 40);
+
+  const sectionProgress = await service.updateProgress({
+    jobId: claimed.id,
+    leaseToken: claimed.leaseToken,
+    phase: "section:theme-health_pressure",
+    percent: 52,
+  });
+  assert.equal(sectionProgress.progressPhase, "section:theme-health_pressure");
+  backend.now = new Date("2026-08-14T03:00:20.000Z");
+  const afterSection = await service.heartbeatLease({
+    jobId: claimed.id,
+    leaseToken: claimed.leaseToken,
+    leaseSeconds: 60,
+  });
+  assert.equal(afterSection.progressPhase, "section:theme-health_pressure");
+  const owned = await service.getOwnedByRequestId(USER_A, REQUEST_A);
+  assert.equal(owned?.progressPhase, "section:theme-health_pressure");
 });
 
 test("atomic completion binds the canonical v2 document to the exact live lease", async () => {