Add CLAUDE.md documenting architecture, decorator system, and JAX rules

[Jammy2211]

Summary

• Adds CLAUDE.md documenting PyAutoLens architecture, dependency chain, key directories, and how the @to_array / @to_grid / @to_vector_yx decorators are inherited from PyAutoArray
• Documents the JAX jit boundary constraint and the if xp is np: guard pattern used in autogalaxy/operate/lens_calc.py

Key content

• Architecture: Tracer, dataset/fit/analysis class table, key directory map
• Decorator system: output-type-by-grid-type table, stacking order, .array access pattern
• JAX rules: why autoarray types can't be JIT outputs, which LensCalc methods implement the guard

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