Add missing JavaDocs

Author: Quinn-With-Two-Ns

temporal-sdk/src/main/java/io/temporal/common/interceptors/ActivityInboundCallsInterceptor.java

@@ -43,6 +43,12 @@ public Object getResult() {
     }
   }
 
+  /**
+   * Provides the interceptor with the {@link ActivityExecutionContext} for the intercepted activity
+   * invocation.
+   *
+   * @param context execution context associated with the running activity.
+   */
   void init(ActivityExecutionContext context);
 
   /**

temporal-sdk/src/main/java/io/temporal/payload/codec/PayloadCodec.java

@@ -14,9 +14,22 @@
  * Encoder implementation.
  */
 public interface PayloadCodec {
+  /**
+   * Applies the codec-specific encoding to the provided payloads.
+   *
+   * @param payloads the payloads that should be encoded.
+   * @return a list containing the encoded representations of {@code payloads}.
+   */
   @Nonnull
   List<Payload> encode(@Nonnull List<Payload> payloads);
 
+  /**
+   * Reverses {@link #encode(List) encode(List)} by decoding the provided payloads back to their
+   * original representation.
+   *
+   * @param payloads the encoded payloads to decode.
+   * @return the decoded payloads that can be consumed by the SDK or user code.
+   */
   @Nonnull
   List<Payload> decode(@Nonnull List<Payload> payloads);
 

temporal-sdk/src/main/java/io/temporal/workflow/QueueConsumer.java

@@ -2,6 +2,14 @@
 
 import java.time.Duration;
 
+/**
+ * A deterministic queue consumer that can be used from workflow code to retrieve items from a
+ * {@link WorkflowQueue}. Implementations mirror the Temporal workflow concurrency model, providing
+ * blocking, cancellable, and non-blocking operations that never interact with standard Java
+ * threading primitives.
+ *
+ * @param <E> type of the elements stored in the queue
+ */
 public interface QueueConsumer<E> {
 
   /**