feat: v3.0.0 - intelligent search, GitHub person/project mode, ELI5, 13+ sources

v3 rewrites the search engine from the ground up:

- Intelligent pre-research: resolves X handles, GitHub repos, subreddits,
  TikTok hashtags, and YouTube channels before searching
- GitHub person-mode: PR velocity, top repos by stars, release notes
- GitHub project-mode: live star counts, README, releases, top issues
- ELI5 mode: plain language synthesis, no jargon
- 13+ sources: Reddit, X, YouTube, TikTok, Instagram, HN, Polymarket,
  GitHub, Threads, Pinterest, Perplexity, Bluesky, Web
- Free Reddit comments via public JSON (no API key needed)
- Fun judge v2: humor scoring baked into narrative
- Cookie consent before browser scanning
- 10,000 free ScrapeCreators calls
- 1,012 tests

Thank you to the community contributors whose issues and PRs shaped v3:
@uppinote20 (#143), @zerone0x (#134, #136), @thinkun (#116),
@thomasmktong (#124), @fanispoulinakisai-boop (#100), @pejmanjohn (#78),
@zl190 (#115), @hnshah (#84, #85, #86)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_normalize_v3.py

@@ -0,0 +1,71 @@
+import sys
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "scripts"))
+
+from lib import normalize
+
+
+class NormalizeV3Tests(unittest.TestCase):
+    def test_youtube_evergreen_fallback_keeps_older_items_when_recent_pool_is_empty(self):
+        items = [
+            {
+                "video_id": "vid-1",
+                "title": "Deploy to Fly.io tutorial",
+                "url": "https://youtube.com/watch?v=vid-1",
+                "channel_name": "Example",
+                "date": "2026-01-10",
+                "engagement": {"views": 1000, "likes": 50, "comments": 10},
+            }
+        ]
+        normalized = normalize.normalize_source_items(
+            "youtube",
+            items,
+            "2026-02-15",
+            "2026-03-17",
+            freshness_mode="evergreen_ok",
+        )
+        self.assertEqual(1, len(normalized))
+        self.assertEqual("2026-01-10", normalized[0].published_at)
+
+    def test_grounding_still_drops_older_items_in_evergreen_mode(self):
+        items = [
+            {
+                "id": "g-1",
+                "title": "Fly.io guide",
+                "url": "https://example.com/fly-guide",
+                "date": "2026-01-08",
+                "date_confidence": "high",
+                "snippet": "Step-by-step guide.",
+            }
+        ]
+        normalized = normalize.normalize_source_items(
+            "grounding",
+            items,
+            "2026-02-15",
+            "2026-03-17",
+            freshness_mode="evergreen_ok",
+        )
+        self.assertEqual([], normalized)
+
+    def test_grounding_requires_a_usable_date(self):
+        items = [
+            {
+                "id": "g-1",
+                "title": "Undated result",
+                "url": "https://example.com/undated",
+                "snippet": "No date attached.",
+            }
+        ]
+        normalized = normalize.normalize_source_items(
+            "grounding",
+            items,
+            "2026-02-15",
+            "2026-03-17",
+        )
+        self.assertEqual([], normalized)
+
+
+if __name__ == "__main__":
+    unittest.main()