feat(bluesky): add Bluesky/AT Protocol as social source

Free, no-auth-required search via public.api.bsky.app.
Always-on like HN and Polymarket (no API key needed).

- New scripts/lib/bluesky.py: search + parse via AT Protocol
- BlueskyItem schema, normalization, scoring, deduplication
- Wired into orchestrator ThreadPoolExecutor with timeout config
- Rendering in compact, full, and JSON output modes
- 14 unit tests covering parsing, dates, relevance, edge cases
- --search=bluesky / --search=bsky for bluesky-only mode

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

scripts/lib/schema.py

@@ -355,6 +355,43 @@ class HackerNewsItem:
         return d
 
 
+@dataclass
+class BlueskyItem:
+    """Normalized Bluesky post."""
+    id: str              # "BS1", "BS2", ...
+    text: str
+    url: str             # bsky.app permalink
+    author_handle: str   # user.bsky.social
+    display_name: str
+    date: Optional[str] = None
+    date_confidence: str = "high"  # AT Protocol has exact timestamps
+    engagement: Optional[Engagement] = None  # likes, reposts, replies, quotes
+    relevance: float = 0.5
+    why_relevant: str = ""
+    subs: SubScores = field(default_factory=SubScores)
+    score: int = 0
+    cross_refs: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict[str, Any]:
+        d = {
+            'id': self.id,
+            'text': self.text,
+            'url': self.url,
+            'author_handle': self.author_handle,
+            'display_name': self.display_name,
+            'date': self.date,
+            'date_confidence': self.date_confidence,
+            'engagement': self.engagement.to_dict() if self.engagement else None,
+            'relevance': self.relevance,
+            'why_relevant': self.why_relevant,
+            'subs': self.subs.to_dict(),
+            'score': self.score,
+        }
+        if self.cross_refs:
+            d['cross_refs'] = self.cross_refs
+        return d
+
+
 @dataclass
 class PolymarketItem:
     """Normalized Polymarket prediction market item."""
@@ -415,6 +452,7 @@ class Report:
     tiktok: List[TikTokItem] = field(default_factory=list)
     instagram: List[InstagramItem] = field(default_factory=list)
     hackernews: List[HackerNewsItem] = field(default_factory=list)
+    bluesky: List[BlueskyItem] = field(default_factory=list)
     polymarket: List[PolymarketItem] = field(default_factory=list)
     best_practices: List[str] = field(default_factory=list)
     prompt_pack: List[str] = field(default_factory=list)
@@ -427,6 +465,7 @@ class Report:
     tiktok_error: Optional[str] = None
     instagram_error: Optional[str] = None
     hackernews_error: Optional[str] = None
+    bluesky_error: Optional[str] = None
     polymarket_error: Optional[str] = None
     # Handle resolution
     resolved_x_handle: Optional[str] = None
@@ -452,6 +491,7 @@ class Report:
             'tiktok': [t.to_dict() for t in self.tiktok],
             'instagram': [ig.to_dict() for ig in self.instagram],
             'hackernews': [h.to_dict() for h in self.hackernews],
+            'bluesky': [b.to_dict() for b in self.bluesky],
             'polymarket': [p.to_dict() for p in self.polymarket],
             'best_practices': self.best_practices,
             'prompt_pack': self.prompt_pack,
@@ -473,6 +513,8 @@ class Report:
             d['instagram_error'] = self.instagram_error
         if self.hackernews_error:
             d['hackernews_error'] = self.hackernews_error
+        if self.bluesky_error:
+            d['bluesky_error'] = self.bluesky_error
         if self.polymarket_error:
             d['polymarket_error'] = self.polymarket_error
         if self.from_cache: