Add phase 2 - download default branch commits for repositories collected in phase 1

tests/test_phase1.py

@@ -5,8 +5,12 @@ from pathlib import Path
 
 import requests
 
-from github_datapipe.config import GithubConfig
-from github_datapipe.extract_repos import SampleReposOptions, resolve_query, sample_repositories
+from github_datapipe.core.config import GithubConfig
+from github_datapipe.phases.phase1_repository_sampling.service import (
+    SampleReposOptions,
+    resolve_query,
+    sample_repositories,
+)
 
 
 def test_resolve_query_uses_default_when_missing() -> None:
@@ -49,7 +53,7 @@ def test_sample_repositories_dedupes_and_persists(monkeypatch, tmp_path: Path) -
             return {"total_count": 3, "items": [fake_repo(102, "owner/repo-three")]}
 
     # Inject the mock sampler into the main code
-    monkeypatch.setattr("github_datapipe.extract_repos.GithubRepoSampler", FakeSampler)
+    monkeypatch.setattr("github_datapipe.phases.phase1_repository_sampling.service.GithubApiClient", FakeSampler)
 
     options = SampleReposOptions(
         count=3,