feat: enhance search, ranking, reranker and CLI tooling across ccw and codex-lens

Major improvements to smart-search, chain-search cascade, ranking pipeline,
reranker factory, CLI history store, codex-lens integration, and uv-manager.
Simplify command-generator skill by inlining phases. Add comprehensive tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

codex-lens/tests/test_ann_index.py

@@ -98,6 +98,23 @@ class TestANNIndex:
         assert ids[0] == 1  # ID of first vector
         assert distances[0] < 0.01  # Very small distance (almost identical)
 
+    @pytest.mark.skipif(
+        not _hnswlib_available(),
+        reason="hnswlib not installed"
+    )
+    def test_search_clamps_top_k_to_available_vectors(self, temp_db, sample_vectors, sample_ids):
+        """Search should clamp top_k to the loaded vector count."""
+        from codexlens.semantic.ann_index import ANNIndex
+
+        index = ANNIndex(temp_db, dim=384)
+        index.add_vectors(sample_ids[:3], sample_vectors[:3])
+
+        ids, distances = index.search(sample_vectors[0], top_k=10)
+
+        assert len(ids) == 3
+        assert len(distances) == 3
+        assert ids[0] == 1
+
     @pytest.mark.skipif(
         not _hnswlib_available(),
         reason="hnswlib not installed"