broker: rugnux live - rugnux runs inside the broker while a DECTRIS rotation collection arrives (demo prototype)

A DECTRIS rotation collection, with the mode switched on (PUT /config/rugnux), goes to
JFJochReceiverRugnux instead of JFJochReceiverLite: the images are forwarded as before, without the
per-image analysis, and one rugnux thread reads them back from the image buffer
(JFJochImageBufferReader) as they arrive. END waits for rugnux and carries its lattice, refined
geometry and per-image results. A small second run on the first 60 degrees reports early whether
there is a lattice. The live state, steps and result are at GET /rugnux/status and on a new
"Rugnux live" frontend page.

rugnux: ProcessConfig::fast_live takes every decision where it is first made and does nothing again
once the sweep is in (near-tie re-checks and the run made again, rotation-scale walk, metric-symmetry
arms, geometry walk, the supercell and quality guards, the doubled cell), so the run ends a fixed
time after the last image. A cut (/cancel, or deadline_s after the last image) hands over what is
established. Off by default: the CLI and the battery are unchanged (--fast-live is hidden, with
--simulate-live).

With the mode off the broker is unchanged. Not built yet.

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

docs/python_client/docs/RugnuxLiveStep.md

@@ -0,0 +1,32 @@
+# RugnuxLiveStep
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**title** | **str** |  | 
+**started_s** | **float** | Start of the step, since the collection started | 
+**duration_s** | **float** | Set once the next step starts or the run ends | [optional] 
+**notes** | **List[str]** | What the step found (e.g. lattice, space group) | 
+
+## Example
+
+```python
+from jfjoch_client.models.rugnux_live_step import RugnuxLiveStep
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of RugnuxLiveStep from a JSON string
+rugnux_live_step_instance = RugnuxLiveStep.from_json(json)
+# print the JSON string representation of the object
+print(RugnuxLiveStep.to_json())
+
+# convert the object into a dict
+rugnux_live_step_dict = rugnux_live_step_instance.to_dict()
+# create an instance of RugnuxLiveStep from a dict
+rugnux_live_step_from_dict = RugnuxLiveStep.from_dict(rugnux_live_step_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+