Refresh .claude/CLAUDE.md documentation

Revise and modernize the CLAUDE.md project documentation: remove explicit NumPy v2.4.2 pin, reword goals to target NumPy 2.x, and clarify core principles (breaking changes accepted to match NumPy). Replace and expand ILKernelGenerator section with concise coverage and file/category listing, update ILKernel implementation details and SIMD notes. Update Shape struct layout (add cached flags/hash/size fields, reorder fields). Remove the verbose Known Issues section, adjust Missing Functions count, and reorganize supported APIs into clearer categorized lists (Array creation, Math, Reductions, Linear Algebra, Random, I/O, etc.). Update CI test invocation to an explicit dotnet run for net10.0 and note OpenBugs file additions. Miscellaneous wording and consistency improvements throughout Q&A and architecture explanations.

Author: Nucs