feat(6243): move_path carries a moved path's snippets with its shapes

Snippet locations are keyed by path too, so a snippet recorded under a
moved directory reads `missing` at its next check. The tool is now
move_path(project_id, from_path, to_path). It moves the ledger rows as
before, and re-paths the project's snippet locations under from_path
through update_snippet, so each body and its indexed mirror stay one
record. A snippet the caller can only read is listed in
snippets_read_only. The tool refuses only when nothing at all is recorded
under from_path. The path test is the one snippets already uses
(_path_touches), and the plugin version is minted for the skill edit.

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

tests/test_pattern_coverage.py

@@ -383,12 +383,12 @@ 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():
+def test_move_path_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")
+    tool = build_mcp_server()._tool_manager.get_tool("move_path")
     assert {"from_path", "to_path"} <= set(tool.parameters.get("properties", {}))
-    assert "move_shapes" in _WRITE_TOOLS
+    assert "move_path" in _WRITE_TOOLS
 
 
 def test_coverage_routes_are_registered():