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_briefing_v3.py

@@ -0,0 +1,35 @@
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "scripts"))
+
+import briefing
+import store
+
+
+class BriefingV3Tests(unittest.TestCase):
+    def test_generate_daily_uses_utc_for_last_run(self):
+        with tempfile.TemporaryDirectory() as tmpdir:
+            db_path = Path(tmpdir) / "research.db"
+            briefs_dir = Path(tmpdir) / "briefs"
+            old_db_override = store._db_override
+            old_briefs_dir = briefing.BRIEFS_DIR
+            try:
+                store._db_override = db_path
+                briefing.BRIEFS_DIR = briefs_dir
+                topic = store.add_topic("test topic")
+                store.record_run(topic["id"], source_mode="v3", status="completed")
+                result = briefing.generate_daily()
+                self.assertEqual(result["status"], "ok")
+                self.assertEqual(result["topics"][0]["name"], "test topic")
+                self.assertIsNotNone(result["topics"][0]["hours_ago"])
+                self.assertGreaterEqual(result["topics"][0]["hours_ago"], 0.0)
+            finally:
+                store._db_override = old_db_override
+                briefing.BRIEFS_DIR = old_briefs_dir
+
+
+if __name__ == "__main__":
+    unittest.main()