feat: register BlogPostStrategy in platform registry

app/services/platforms/__init__.py

@@ -3,13 +3,14 @@ from __future__ import annotations
 from app.services.platforms.base import PostingStrategy, PostResult
 from app.services.platforms.reddit_post import RedditPostStrategy
 from app.services.platforms.reddit_comment import RedditCommentStrategy
+from app.services.platforms.blog_post import BlogPostStrategy
 
 _REGISTRY: dict[str, PostingStrategy] = {
     s.campaign_type: s()
     for s in [
         RedditPostStrategy,
         RedditCommentStrategy,
-        # BlogPostStrategy — added in Plan C
+        BlogPostStrategy,
     ]
 }
 

tests/services/platforms/test_registry.py

@@ -1,6 +1,7 @@
 import pytest
 from app.services.platforms import get_client, SUPPORTED_PLATFORMS
 from app.services.platforms.reddit_post import RedditPostStrategy
+from app.services.platforms.blog_post import BlogPostStrategy
 
 
 def test_get_client_returns_reddit_post_strategy():
@@ -15,3 +16,12 @@ def test_get_client_unknown_type_raises():
 
 def test_supported_platforms_contains_reddit_post():
     assert "reddit_post" in SUPPORTED_PLATFORMS
+
+
+def test_get_client_returns_blog_post_strategy():
+    client = get_client("blog_post")
+    assert isinstance(client, BlogPostStrategy)
+
+
+def test_supported_platforms_contains_blog_post():
+    assert "blog_post" in SUPPORTED_PLATFORMS