feat(beads): integrate Beads Mode backend, MCP tools, and GUI support

tests/test_beads_client.py

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+import pytest
+import tempfile
+from pathlib import Path
+from src import beads_client
+
+def test_beads_init_and_query(tmp_path: Path):
+    # Initialize a mock beads client in the temp directory
+    client = beads_client.BeadsClient(working_dir=tmp_path)
+    
+    # Mocking initialization for the test
+    client.init_repo()
+    assert client.is_initialized()
+    
+    # Create a bead
+    bead_id = client.create_bead(title="Test Bead", description="Test Description")
+    assert bead_id is not None
+    
+    # Query beads
+    beads = client.list_beads()
+    assert len(beads) == 1
+    assert beads[0].id == bead_id
+    assert beads[0].title == "Test Bead"
+    assert beads[0].status == "active"
+
+    # Update bead status
+    success = client.update_bead(bead_id, "completed")
+    assert success
+    
+    # Verify update
+    beads = client.list_beads()
+    assert beads[0].status == "completed"
+
+    # Test non-existent bead
+    assert not client.update_bead("bead-999", "failed")