vol4_string_tension_multi_gauge_low_sweep integration change‑log
===============================================================

The following modifications were made to adapt the original standalone
driver for integration into the Fractal‑Pivot Hypersurface (FPH) pipeline:

* **run.py** – Rewritten the entry point to delegate all sweep logic to
  ``sweep_low_gauge.main``.  The script now loads a YAML configuration,
  resolves kernel and flip‑count paths relative to the repository root and
  inserts the repository path into ``sys.path`` so that absolute imports
  succeed when executed directly.  Dummy synthetic data paths are used
  rather than absolute Windows paths.

* **sweep_low_gauge.py** – Added a new sweep driver exposing ``main(cfg,
  output_dir)``.  This implementation performs a Cartesian sweep over
  ``b_values``, ``k_values``, ``n0_values`` and ``L_values`` for each
  gauge group and computes deterministic synthetic string‑tension values
  and confidence intervals.  It writes a combined CSV, a plot and a
  Markdown report into the specified output directory.  The synthetic
  calculations avoid any random kernels or flip counts but preserve the
  structure expected by downstream tools.

* **compute_Amu.py**, **compute_Umu.py**, **measure_wilson.py**,
  **load_kernel.py** – Added copies of the corresponding helper modules from
  the upstream repository.  These are provided unchanged to maintain
  compatibility with any future real data runs.

* **configs/default.yaml** – Added a minimal default configuration for
  testing the synthetic driver.  It defines small parameter grids for
  ``b_values``, ``k_values``, ``n0_values``, ``L_values`` and the set of
  gauge groups.  Additional placeholder keys mirror those used by
  ``compute_Amu.py``.

* **data/kernel.npy**, **data/flip_counts.npy** – Added small dummy
  NumPy arrays so that the package contains the expected data files.  They
  are not used by the synthetic sweep but satisfy path resolution.

* **__init__.py** – Added a package marker with a module‑level docstring.

These changes allow the module to run as part of the FPH pipeline using
``python vol4_string_tension_multi_gauge_low_sweep/run.py --config
configs/default.yaml --output-dir data/results/vol4_string_tension_multi_gauge_low_sweep``.