feat(6243): a directory moved in the tree keeps its shape judgments

Ledger rows are keyed by path, so after a directory moves the next sync
marks every judged row vanished and lists the same shapes again, unjudged.
move_shapes(project_id, from_path, to_path) re-keys the rows under one path
to the other, in every repo of the project, keeping each row's judgment,
uses edges and history and adding a `moved` event that records the path it
left. A row already at the target is replaced when nobody judged it; a
judged one stands, and the old row is reported in `kept`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_pattern_coverage.py

@@ -383,6 +383,14 @@ def test_bind_repo_tool_can_move_a_renamed_repo():
     assert "moved_from" in tool.parameters.get("properties", {})
 
 
+def test_move_shapes_is_mounted_as_a_write_tool():
+    """A directory moved in the tree carries its judgments to the new path."""
+    from grimoire.mcp.server import _WRITE_TOOLS, build_mcp_server
+    tool = build_mcp_server()._tool_manager.get_tool("move_shapes")
+    assert {"from_path", "to_path"} <= set(tool.parameters.get("properties", {}))
+    assert "move_shapes" in _WRITE_TOOLS
+
+
 def test_coverage_routes_are_registered():
     from grimoire.app import create_app