Merge PR #48: feat: add Xiaohongshu source + Reddit public fallback

- Xiaohongshu search via local MCP service (opt-in, zero impact if service not running)
- Reddit public JSON fallback (works with zero API keys)
- Reddit priority: ScrapeCreators -> OpenAI -> public fallback
- Updated env.py: Reddit always available via public fallback

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/package/dist/lib/twitter-client-engagement.d.ts

@@ -0,0 +1,16 @@
+import type { AbstractConstructor, Mixin, TwitterClientBase } from './twitter-client-base.js';
+import type { BookmarkMutationResult } from './twitter-client-types.js';
+export interface TwitterClientEngagementMethods {
+    /** Like a tweet. */
+    like(tweetId: string): Promise<BookmarkMutationResult>;
+    /** Remove a like from a tweet. */
+    unlike(tweetId: string): Promise<BookmarkMutationResult>;
+    /** Retweet a tweet. */
+    retweet(tweetId: string): Promise<BookmarkMutationResult>;
+    /** Remove a retweet. */
+    unretweet(tweetId: string): Promise<BookmarkMutationResult>;
+    /** Bookmark a tweet. */
+    bookmark(tweetId: string): Promise<BookmarkMutationResult>;
+}
+export declare function withEngagement<TBase extends AbstractConstructor<TwitterClientBase>>(Base: TBase): Mixin<TBase, TwitterClientEngagementMethods>;
+//# sourceMappingURL=twitter-client-engagement.d.ts.map