tests: centralize script path setup in conftest.py

Add a pytest-discovered tests/conftest.py for the last30days scripts path and
remove duplicate per-file sys.path.insert boilerplate from tests.

Normalize affected imports to rely on the shared scripts path and remove the
now-unneeded E402 suppressions.

tests/test_hackernews.py

@@ -1,20 +1,16 @@
 """Tests for hackernews.py - HN search via Algolia API."""
 
 import json
-import sys
 from datetime import datetime, timezone
-from pathlib import Path
 from unittest.mock import Mock, patch
 
 import pytest
 
-sys.path.insert(0, str(Path(__file__).parent.parent / "skills" / "last30days" / "scripts"))
-
 from lib import hackernews
 
-
 # === Helper Functions ===
 
+
 def create_mock_hit(
     object_id="12345",
     title="Test HN Story",
@@ -40,9 +36,9 @@ def create_mock_hit(
         "url": url,
     }
 
-
 # === Tests for _date_to_unix() ===
 
+
 def test_date_to_unix_basic():
     """Test converting YYYY-MM-DD to Unix timestamp."""
     result = hackernews._date_to_unix("2026-01-01")
@@ -59,9 +55,9 @@ def test_date_to_unix_leap_day():
     expected = datetime(2024, 2, 29, tzinfo=timezone.utc).timestamp()
     assert result == int(expected)
 
-
 # === Tests for _unix_to_date() ===
 
+
 def test_unix_to_date_basic():
     """Test converting Unix timestamp to YYYY-MM-DD."""
     ts = int(datetime(2026, 1, 15, tzinfo=timezone.utc).timestamp())
@@ -77,9 +73,9 @@ def test_unix_to_date_with_time():
     
     assert result == "2026-01-15"
 
-
 # === Tests for _strip_html() ===
 
+
 def test_strip_html_basic():
     """Test HTML stripping and entity decoding."""
     html_text = "<p>Hello &amp; goodbye</p>"
@@ -113,9 +109,9 @@ def test_strip_html_entities():
     # Entities are decoded
     assert "&" in result or "test" in result
 
-
 # === Tests for _title_matches_query() ===
 
+
 def test_title_matches_query_basic():
     """Test basic query matching."""
     title = "New AI framework for developers"
@@ -199,10 +195,11 @@ def test_title_matches_query_flattens_hyphens_and_commas():
     # query 'rust, go, zig' flattens; title contains 'go'
     assert hackernews._title_matches_query("Go 1.24 generics update", "rust, go, zig") is True
 
-
 # === Tests for search_hackernews() ===
 
 @patch('lib.hackernews.http.request')
+
+
 def test_search_hackernews_basic(mock_request):
     """Test basic HN search."""
     mock_request.return_value = {
@@ -221,8 +218,9 @@ def test_search_hackernews_basic(mock_request):
     assert len(result["hits"]) == 1
     assert mock_request.called
 
-
 @patch('lib.hackernews.http.request')
+
+
 def test_search_hackernews_depth_config(mock_request):
     """Test that depth parameter controls hit count."""
     mock_request.return_value = {"hits": [], "nbHits": 0}
@@ -235,8 +233,9 @@ def test_search_hackernews_depth_config(mock_request):
     
     assert "hitsPerPage=15" in url
 
-
 @patch('lib.hackernews.http.request')
+
+
 def test_search_hackernews_date_filtering(mock_request):
     """Test that date range is applied correctly."""
     mock_request.return_value = {"hits": [], "nbHits": 0}
@@ -250,8 +249,9 @@ def test_search_hackernews_date_filtering(mock_request):
     assert "numericFilters" in url
     assert "created_at_i" in url
 
-
 @patch('lib.hackernews.http.request')
+
+
 def test_search_hackernews_http_error_handling(mock_request):
     """Test graceful handling of HTTP errors."""
     from lib.http import HTTPError
@@ -263,8 +263,9 @@ def test_search_hackernews_http_error_handling(mock_request):
     assert result["hits"] == []
     assert "error" in result
 
-
 @patch('lib.hackernews.http.request')
+
+
 def test_search_hackernews_engagement_filter(mock_request):
     """Test that low-engagement stories are filtered."""
     mock_request.return_value = {"hits": [], "nbHits": 0}
@@ -277,9 +278,9 @@ def test_search_hackernews_engagement_filter(mock_request):
     # Should filter for points > 2 (URL-encoded)
     assert "points" in url and "%3E2" in url
 
-
 # === Tests for parse_hackernews_response() ===
 
+
 def test_parse_hackernews_response_basic():
     """Test parsing basic Algolia response."""
     response = {
@@ -402,9 +403,9 @@ def test_parse_hackernews_response_empty_response():
     
     assert items == []
 
-
 # === Tests for engagement scoring ===
 
+
 def test_engagement_score_calculation():
     """Test that engagement dict contains points and comments."""
     response = {
@@ -435,6 +436,5 @@ def test_engagement_score_zero_values():
     assert engagement["points"] == 0
     assert engagement["comments"] == 0
 
-
 if __name__ == "__main__":
     pytest.main([__file__, "-v"])