chore: audit(2026-05) phase 2a slice 2: extract training-core concern from AiModelBuilder

[ooples]

Stacked on #1432. Extracts the 9 training-core Configure methods (Model, Optimizer, Regularization, FitnessCalculator, FitDetector, TrainingPipeline, CheckpointManager, MemoryManagement, TrainingMonitor) into a separately-testable IAiModelTrainingCore<T,TInput,TOutput> component, following the double-write delegation pattern from slice 1.

This is the dependency root for slices 3 / 4 / 6 / 7 / 9 / 10 / 11 — those concerns each consume the trained model or optimizer in some way, so they all wait for this component to land before they can migrate.

Verification

• Core builds clean on net10.0 (0 errors)
• Core builds clean on net471 (0 errors)
• 26 / 26 Configuration tests pass (14 slice 1 + 12 slice 2)

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Original title:
audit(2026-05) phase 2a slice 2: extract training-core concern from AiModelBuilder

New title:
chore: audit(2026-05) phase 2a slice 2: extract training-core concern from AiModelBuilder

Detected type: chore: (default type)
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