fix: default tracker version to 1 and remove version clamp from token decode

Author: mattrmc1

lib/sdk/server-ai/src/main/java/com/launchdarkly/sdk/server/ai/LDAIClientImpl.java

@@ -289,7 +289,7 @@ private Supplier<LDAIConfigTracker> trackerFactory(
       LDContext context) {
     String modelName = model != null && model.getName() != null ? model.getName() : "";
     String providerName = provider != null && provider.getName() != null ? provider.getName() : "";
-    int ver = version != null ? version : 0;
+    int ver = version != null ? version : 1;
     return () -> new LDAIConfigTrackerImpl(
         client,
         UUID.randomUUID().toString(),

lib/sdk/server-ai/src/main/java/com/launchdarkly/sdk/server/ai/internal/ResumptionTokens.java

@@ -160,10 +160,7 @@ private static Decoded parseJson(String json) {
       throw new IllegalArgumentException("Resumption token missing required field 'version'");
     }
 
-    // Clamp version: a missing version field defaults to 0 in older tokens, but configs default to 1.
-    int clampedVersion = Math.max(1, version);
-
-    return new Decoded(runId, configKey, variationKey, clampedVersion, graphKey);
+    return new Decoded(runId, configKey, variationKey, version, graphKey);
   }
 
   private static int skipWhitespace(String s, int pos) {

lib/sdk/server-ai/src/test/java/com/launchdarkly/sdk/server/ai/internal/ResumptionTokensTest.java

@@ -78,20 +78,10 @@ public void roundTripWithUnicodeInKeys() {
     assertThat(d.getRunId(), is(runId));
   }
 
-  // ---- version clamping -----------------------------------------------------
+  // ---- version round-trip ---------------------------------------------------
 
   @Test
-  public void versionBelowOneIsClampedToOne() {
-    // Construct a token with version 0 directly to simulate an old token.
-    String json = "{\"runId\":\"r\",\"configKey\":\"c\",\"version\":0}";
-    String token = java.util.Base64.getUrlEncoder().withoutPadding()
-        .encodeToString(json.getBytes(java.nio.charset.StandardCharsets.UTF_8));
-    ResumptionTokens.Decoded d = ResumptionTokens.decode(token);
-    assertThat(d.getVersion(), is(1));
-  }
-
-  @Test
-  public void versionOneIsNotClamped() {
+  public void versionIsPreservedOnRoundTrip() {
     String token = ResumptionTokens.encode("r", "c", null, 1, null);
     assertThat(ResumptionTokens.decode(token).getVersion(), is(1));
   }