Anomalous difference map: ANOM/PHANOM in _maps.mtz, /rugnux/map.ccp4?type=anom, a magenta mesh in the viewer

Model validation already made the anomalous difference map's coefficients ((F(+) - F(-)) on the model
phases less 90 degrees, where the merge kept the Bijvoet pairs) to read the anomalous sites, then threw
them away. They now go into the map coefficients as ANOM/PHANOM (phenix.maps' labels), missing on the
reflections without a pair, so _maps.mtz opens as an anomalous map in Coot. Nothing in scaling, merging
or the validation's decisions changes; a merge without the Bijvoet split writes the twelve columns as before.

The broker serves the map as /rugnux/map.ccp4?type=anom (404 without Bijvoet pairs), and
rugnux_live_status.anomalous_map says it is there. The Mol* viewer loads it only then, as a magenta mesh
at +4 sigma with its own level slider and switch.

Tests: ANOM/PHANOM appear with Bijvoet pairs (as many as the reported pairs) and not without; the served
anomalous map of a point peaks at it; the auth test covers type=anom. End to end (myoglobin 2M replay):
anomalous_map true, the served map equals gemmi's FFT of ANOM/PHANOM in the written _maps.mtz to 3.4e-6 rms.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
(cherry picked from commit c4d6ad74c706181cbb183cfcaa2481653cd7cad6)

docs/python_client/docs/DefaultApi.md

@@ -4081,7 +4081,7 @@ This endpoint does not need any parameter.
 Get an electron-density map of the last rugnux live run
 
 The map of the placed model (`/rugnux/model.cif`) in CCP4 format (mode 2, float), made from the map
-coefficients written to `_maps.mtz`. It covers one unit cell centred on the model - along an axis where
+coefficients written to `_maps.mtz` (FWT/PHWT, DELFWT/PHDELWT, ANOM/PHANOM). It covers one unit cell centred on the model - along an axis where
 the model reaches further than the cell, the model plus 5 A instead - sampled every d_min/3; the mean and
 RMS in its header are those of the unit cell, so contour levels in sigma are the usual ones.
 
@@ -4115,7 +4115,7 @@ configuration = jfjoch_client.Configuration(
 with jfjoch_client.ApiClient(configuration) as api_client:
     # Create an instance of the API class
     api_instance = jfjoch_client.DefaultApi(api_client)
-    type = 2fofc # str | `2fofc`: the 2mFo-DFc map; `fofc`: the mFo-DFc difference map (optional) (default to 2fofc)
+    type = 2fofc # str | `2fofc`: the 2mFo-DFc map; `fofc`: the mFo-DFc difference map; `anom`: the anomalous difference map, (F(+) - F(-)) on the model phases less 90 degrees, where the merge kept the Bijvoet pairs (`anomalous_map` in `/rugnux/status`)  (optional) (default to 2fofc)
 
     try:
         # Get an electron-density map of the last rugnux live run
@@ -4133,7 +4133,7 @@ with jfjoch_client.ApiClient(configuration) as api_client:
 
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
- **type** | **str**| `2fofc`: the 2mFo-DFc map; `fofc`: the mFo-DFc difference map | [optional] [default to 2fofc]
+ **type** | **str**| `2fofc`: the 2mFo-DFc map; `fofc`: the mFo-DFc difference map; `anom`: the anomalous difference map, (F(+) - F(-)) on the model phases less 90 degrees, where the merge kept the Bijvoet pairs (`anomalous_map` in `/rugnux/status`)  | [optional] [default to 2fofc]
 
 ### Return type
 
@@ -4155,7 +4155,7 @@ Name | Type | Description  | Notes
 **200** | Map |  -  |
 **400** | Unknown map type |  -  |
 **401** | The current dataset is protected and no valid bearer token was presented. |  -  |
-**404** | The last rugnux live run placed no model or made no maps |  -  |
+**404** | The last rugnux live run placed no model or made no maps, or (`anom`) has no Bijvoet pairs |  -  |
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 

docs/python_client/docs/RugnuxLiveStatus.md

@@ -8,6 +8,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **state** | **str** |  | 
 **placed_model** | **bool** | The run placed the model: it can be fetched from `/rugnux/model.cif` and its maps from `/rugnux/map.ccp4`.  | 
+**anomalous_map** | **bool** | The merge kept the Bijvoet pairs, so with the placed model there is an anomalous difference map (`/rugnux/map.ccp4?type=anom`).  | 
 **probe** | **str** | Answer of the early lattice probe on the first 60 degrees; empty until it answers | 
 **probe_s** | **float** | When the probe answered, since the first image | [optional] 
 **start_to_first_image_s** | **float** | From the START message to the first image; set once the first image arrives | [optional]