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/JfjochSettings.md

@@ -27,6 +27,7 @@ Name | Type | Description | Notes
 **zeromq_preview** | [**ZeromqPreviewSettings**](ZeromqPreviewSettings.md) |  | [optional] 
 **zeromq_metadata** | [**ZeromqMetadataSettings**](ZeromqMetadataSettings.md) |  | [optional] 
 **dark_mask** | [**DarkMaskSettings**](DarkMaskSettings.md) |  | [optional] 
+**rugnux** | [**RugnuxSettings**](RugnuxSettings.md) |  | [optional] 
 
 ## Example