Add channelBitMask to MemoryDescription for selective channel modification

[Copilot]

Adds channelBitMask (uint8_t, default 0xFF) to MemoryDescription and MemoryGenomeDescription to control which signal channels can be modified by the MemoryProcessor. Bit N corresponds to channel[N].

Data Structures

• Added channelBitMask to MemoryDescription, MemoryGenomeDescription, and GPU equivalents (Memory, MemoryTO, MemoryGenome, MemoryGenomeTO)

MemoryProcessor Logic

• All modes (SignalDelay, SignalRecorder, SignalStorage, SignalIntegrator) now respect the bitmask when writing to cell->signal.channels[k]:

if (channelBitMask & (1 << k)) {
    cell->signal.channels[k] = output.channels[k];
}

Data Pipeline

• DescriptionConverterService: TO ↔ Description conversion
• ObjectFactory: Node/Cell creation from TO and genome
• DataAccessKernels: GPU TO creation
• SerializerService: Save/load support
• GenomeDescriptionHash: Hash computation

UI

• Added 8 checkboxes in NodeEditorWidget for Memory cell type to edit each bit independently

Original prompt

Add a new member channelBitMask to MemoryDescription (uint8_t, default 0b11111111) and MemoryGenomeDescription. Adapt TO.cuh, Object.cuh, DescriptionConverterService, ObjectFactory, DataAccessKernel, SerializerService, GenomeDescriptionHash, DescriptionTestDataFactory, GenomeDescriptionValidationService, etc.
The following logic for channelBitMask should be implemented:

• The lowest bit (i.e. bit pos 0) should correspond to channel[0], the highest bit to channel[MAX_CHANNELS - 1] (MAX_CHANNELS is currently 8).
• In MemoryProcessor: in all modes only, the channels of the cell's signal can be modified if the corresponding bit in the bit mask is 1. otherwise the corresponding channel should be left unchanged
  In NodeEditorWidget: For each bit in the mask there should be a AlienGui::Checkbox to edit it.

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[chrxh]

@copilot branch has been rebased. check again

[Copilot]

@copilot branch has been rebased. check again

Verified after rebase - build succeeds and all tests pass (EngineInterfaceTests: 145 tests, NetworkTests: 4 tests, PersisterTests: 57 tests). The channelBitMask changes are intact and working correctly.