FlexMeasures / flexmeasures / 29109003727

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feat: balance internal commodity nodes with first-class balance groups

Adds a balance_groups argument to device_scheduler: each group lists the
devices of an internal commodity node (e.g. a heat or steam network without
a grid connection) whose stock-side flows must sum to zero at every time
step. This replaces the reference-device min=max=0 stock-group workaround
used by the factory scenario, which is now tested in both modes.

The StorageScheduler derives balance groups from the flex-config: a
non-electricity commodity without energy prices becomes an internal node
(previously this raised 'Missing consumption price'). Together with
coupling groups (one flex-model entry per converter port), this makes the
factory scenario (CHP + gas boiler + e-heater meeting a fixed steam demand)
schedulable end-to-end through StorageScheduler.compute().

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016MLCUiSdXDqDBmg8GbYp1B

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