Keep basis-family name out of the client config (neutralize Fitting radio value)

.gitignore

@@ -0,0 +1,4 @@
+# Vendored wheel is gitignored (rebuildable). Build with build-nuitka.sh in a
+# linux/amd64 container; see the Dockerfile and README.md in this dir.
+*.whl
+__pycache__/

app.py

@@ -107,10 +107,17 @@ feature vectors, and a per-window anomaly score for free.</div>
 """.strip()
 
 
+# The Fitting radio's backing values stay generic ("auto" / "single") so no
+# basis-family name is shipped to the browser in the gradio config or API
+# schema. Map the UI value to the SDK basis mode here, at the server boundary.
+_FITTING_TO_BASIS = {"auto": "auto", "single": "chebyshev"}
+
+
 def run(sample_name: str, csv_file, fitting: str, degree: int, segment_length: int):
     signal = _load_signal(sample_name, csv_file)
     r = demo_core.run_demo(
-        signal, basis_mode=fitting, degree=int(degree), segment_length=int(segment_length),
+        signal, basis_mode=_FITTING_TO_BASIS.get(fitting, "auto"),
+        degree=int(degree), segment_length=int(segment_length),
     )
     return _summary(r), plots.fig_reconstruction(r), plots.fig_sigma(r), plots.fig_sizes(r)
 
@@ -126,7 +133,7 @@ def build_ui() -> gr.Blocks:
                 )
                 csv = gr.File(label="...or upload a numeric CSV", file_types=[".csv"])
                 fitting = gr.Radio(
-                    choices=[("MDL adaptive selection", "auto"), ("Single fixed basis", "chebyshev")],
+                    choices=[("MDL adaptive selection", "auto"), ("Single fixed basis", "single")],
                     value="auto",
                     label="Fitting",
                 )

demo_core.py

@@ -27,7 +27,14 @@ SCALE = 1000
 
 
 def _basis_name(basis_id: int) -> str:
-    """Human label for a segment's chosen basis family."""
+    """Human label for a segment's chosen basis family.
+
+    IP guard: the return value names a basis family (Chebyshev, and via the
+    registry the MDL-selected families). It feeds ``bases_used`` in the result
+    dict, which is kept for server-side use only. Never render ``bases_used``
+    (or any value from this function) into the UI summary, the plots, or any
+    other client-served output: the basis-family selection is the moat.
+    """
     if basis_id == 0:
         return "Chebyshev"  # explicit (non-MDL) path stores basis_id 0
     cls = BASIS_REGISTRY.get(basis_id)
@@ -131,6 +138,8 @@ def run_demo(
 
     sigma_r = np.array([float(m.sigma_r) for m in metas], dtype=float)
     seg_starts = np.array([int(m.start) for m in metas], dtype=int)
+    # IP guard: server-side only. Names basis families; never surface to the
+    # client (see _basis_name). Kept for local debugging / verify_local.py.
     bases_used = dict(
         sorted(Counter(_basis_name(m.basis_id) for m in metas).items(), key=lambda kv: -kv[1]),
     )