Update LOKI default monitor names to m-prefix convention

[Copilot]

LOKI monitor naming was updated to use an m prefix, but loki_default_parameters() still hardcoded the old names, breaking offline users who rely on defaults.

Change

• src/ess/loki/workflow.py: Update default NeXusMonitorName values in loki_default_parameters():

# Before
NeXusMonitorName[Incident]: 'beam_monitor_1',
NeXusMonitorName[Transmission]: 'beam_monitor_3',

# After
NeXusMonitorName[Incident]: 'beam_monitor_m1',
NeXusMonitorName[Transmission]: 'beam_monitor_m3',

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update hardcoded LOKI monitor names to use m-prefix convention</issue_title>
<issue_description>## Context

LOKI monitor naming was recently updated to use an m prefix (e.g., beam_monitor_1 → beam_monitor_m1, beam_monitor_3 → beam_monitor_m3).

LokiWorkflow() still hardcodes the old names as defaults:

# Currently in LokiWorkflow defaults:
NeXusMonitorName[Incident] = 'beam_monitor_1'
NeXusMonitorName[Transmission] = 'beam_monitor_3'

These should be updated to:

NeXusMonitorName[Incident] = 'beam_monitor_m1'
NeXusMonitorName[Transmission] = 'beam_monitor_m3'

Impact

In ESSlivedata, we now pass the resolved monitor names from the aux source configuration into the factory, overriding the defaults. So the live dashboard is not affected. However, offline users of LokiWorkflow() who rely on the defaults will get stale names.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update hardcoded LOKI monitor names to use m-prefix convention #247

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