fix(orb): close a partial-branch coverage gap in the health-ping change

Three D1-driver-typing fallbacks (COUNT(*) can't actually return NULL for
a matched row; .all() always returns a `results` array) were never
reachable via real usage, only via the driver's own optional TypeScript
typing -- mark them explicitly rather than leaving codecov/patch red on
dead branches.

Author: github-actions[bot]

src/orb/analytics.ts

@@ -280,6 +280,9 @@ export async function getFleetHealthSummary(env: Env, now: Date = new Date()): P
       .first<{ healthy_count: number | null; unhealthy_count: number | null; total_count: number }>();
     const healthyCount = Number(row?.healthy_count ?? 0);
     const unhealthyCount = Number(row?.unhealthy_count ?? 0);
+    /* v8 ignore next -- COUNT(*) always returns a non-null number for a matched row (unlike the SUM(CASE...)
+     *  cells above, which legitimately return NULL over zero matching rows); the ?? 0 only guards `row` being
+     *  absent entirely, which a scalar aggregate query never produces. */
     const totalCount = Number(row?.total_count ?? 0);
     return { healthyCount, unhealthyCount, unknownCount: totalCount - healthyCount - unhealthyCount, totalCount };
   } catch {

src/selfhost/orb-collector.ts

@@ -195,6 +195,8 @@ export async function exportOrbBatch(db: D1Database, batchSize = 200, fetchFn: t
 
   const payload: OrbExportPayload = {
     instance_id: instance,
+    /* v8 ignore next -- D1's .all() always returns a `results` array (possibly empty), never omits the field;
+     *  the ?? [] only guards the driver's own optional typing, not a real runtime path. */
     events: (results ?? []).map((r) => ({
       repo_hash: anonymize ? hmacAnonymize(r.project, secret) : r.project,
       pr_hash: anonymize ? hmacAnonymize(r.target_id, secret) : r.target_id,
@@ -253,6 +255,7 @@ export async function exportOrbBatch(db: D1Database, batchSize = 200, fetchFn: t
       .run();
   }
 
+  /* v8 ignore next -- same D1 .all() guarantee as above: `results` is always at least an empty array here. */
   const exportedCount = results?.length ?? 0;
   if (exportedCount > 0) incr("loopover_orb_events_exported_total", {}, exportedCount);
   return exportedCount;