test(05-02): tighten loader-env L3 to require pair 1 serving at pinned origin (RED)

- L3 previously pinned the 05-01 empty-seed state (honest null at the pinned origin)
- it now asserts the default fixture source SERVES pair 1 (kl-tower-to-kl-sentral)
  at its pinned public origin and resolves honest null ~300 m away (outside the
  200 m tolerance, D-03)
- RED until plan 05-02 populates the committed fixture dataset

routing/test/loader-env.test.mjs

@@ -14,9 +14,11 @@
  *   L2  esbuild — the bundler family of BOTH wrangler and Vite INLINES the
  *       seed: the bundle text carries the `router.project-osrm.org` marker
  *       (the `_source` header survives inlining)
- *   L3  the committed EMPTY seed serves null through the whole default path
- *       (static import -> lazy index -> route()) — the honest corpus state
- *       until plan 05-02 fills it
+ *   L3  the committed corpus serves pair 1 (kl-tower-to-kl-sentral) through
+ *       the whole default path (static import -> lazy index -> route()) at
+ *       its PINNED PUBLIC origin, and resolves honest null for an origin
+ *       ~300 m away (outside the 200 m tolerance — D-03). The empty-seed
+ *       state was 05-01's; plan 05-02 arms this gate with the real corpus.
  *
  * Run:  npm run routing:test   (exit 0 = all green)
  */
@@ -74,17 +76,35 @@ test("L2 esbuild bundle marker — the wrangler/Vite bundler family inlines the
   );
 });
 
-test("L3 the empty committed seed serves null — the honest corpus state until 05-02", async () => {
+test("L3 the committed corpus serves pair 1 at its pinned origin; honest null ~300 m away", async () => {
   const mod = await loadIndex();
   const source = mod.createFixtureRoutingSource();
   assert.equal(source.name, "fixture");
-  const result = await source.route({
+  // Pair 1 of the pinned corpus (kl-tower-to-kl-sentral): a request at the
+  // PINNED PUBLIC origin must serve through the whole default path.
+  const served = await source.route({
     origin: { lat: 3.1528, lng: 101.7038 },
     destinationId: "kl-sentral",
   });
+  assert.ok(
+    served,
+    "the committed corpus must serve pair 1 (kl-tower-to-kl-sentral) at its pinned origin — an empty seed is the 05-01 state, never the shipped one",
+  );
+  assert.equal(served.backend, "fixture");
+  assert.equal(served.destinationId, "kl-sentral");
+  assert.ok(
+    served.options.length >= 1,
+    "at least the best (index-0) route serves, best-first order",
+  );
+  // ~0.0027 deg lat ≈ 300 m — OUTSIDE the 200 m origin tolerance. The honest
+  // "router pending" null (D-03), never a nearest-match fabrication.
+  const pending = await source.route({
+    origin: { lat: 3.1528 + 0.0027, lng: 101.7038 },
+    destinationId: "kl-sentral",
+  });
   assert.equal(
-    result,
+    pending,
     null,
-    "the committed empty corpus must parse through the whole path and serve honest null",
+    "an origin ~300 m from the pinned pair origin is outside the 200 m tolerance — honest null (D-03)",
   );
 });