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_xurl_x.py

@@ -1,20 +1,16 @@
 """Tests for xurl_x module."""
 
 import json
-import sys
 import unittest
-from pathlib import Path
 from unittest import mock
 
-sys.path.insert(0, str(Path(__file__).parent.parent / "skills" / "last30days" / "scripts"))
-
 from lib import xurl_x
 
-
 # ---------------------------------------------------------------------------
 # Helpers
 # ---------------------------------------------------------------------------
 
+
 def _make_api_response(tweets=None, users=None):
     """Build a minimal X API v2 search/recent response."""
     tweets = tweets or []
@@ -24,11 +20,11 @@ def _make_api_response(tweets=None, users=None):
         resp["includes"] = {"users": users}
     return resp
 
-
 # ---------------------------------------------------------------------------
 # is_available
 # ---------------------------------------------------------------------------
 
+
 class TestIsAvailable(unittest.TestCase):
     def test_returns_true_when_xurl_authenticated(self):
         completed = mock.Mock(returncode=0, stdout='{"username": "testuser"}')
@@ -62,11 +58,11 @@ class TestIsAvailable(unittest.TestCase):
         with mock.patch("subprocess.run", return_value=completed):
             self.assertFalse(xurl_x.is_available())
 
-
 # ---------------------------------------------------------------------------
 # search_x
 # ---------------------------------------------------------------------------
 
+
 class TestSearchX(unittest.TestCase):
     def test_returns_parsed_json_on_success(self):
         payload = {"data": [{"id": "1", "text": "hello world", "author_id": "u1"}]}
@@ -127,11 +123,11 @@ class TestSearchX(unittest.TestCase):
         n_idx = call_args.index("-n")
         self.assertEqual(int(call_args[n_idx + 1]), xurl_x.DEPTH_CONFIG["default"])
 
-
 # ---------------------------------------------------------------------------
 # parse_x_response
 # ---------------------------------------------------------------------------
 
+
 class TestParseXResponse(unittest.TestCase):
     def _tweet(self, id_, text, author_id, created_at=None, metrics=None):
         t = {"id": id_, "text": text, "author_id": author_id}
@@ -240,11 +236,11 @@ class TestParseXResponse(unittest.TestCase):
         items = xurl_x.parse_x_response(resp)
         self.assertEqual(items[0]["why_relevant"], "")
 
-
 # ---------------------------------------------------------------------------
 # DEPTH_CONFIG
 # ---------------------------------------------------------------------------
 
+
 class TestDepthConfig(unittest.TestCase):
     def test_all_standard_depths_present(self):
         for depth in ("quick", "default", "deep"):
@@ -256,6 +252,5 @@ class TestDepthConfig(unittest.TestCase):
             xurl_x.DEPTH_CONFIG["quick"],
         )
 
-
 if __name__ == "__main__":
     unittest.main()