Move PyHPC profiling notebooks after notebook 02

[robobryce]

Summary

Move the three profiling/kernel notebooks immediately after notebook 02 and renumber the remaining PyHPC ladder:

• 10–12 → 03–05: CuPy asynchrony, copy kernel authoring, histogram kernel authoring
• old 03 → 06: mpi4py
• old 04–09 → 07–12: SWE ladder
• 13: unchanged

Rename all corresponding solution notebooks and update the README, syllabus, notebook cross-references, test order, dependency comments, ignored-artifact comments, and CSCS profiling filter.

Validation

• validated all 26 notebook files with nbformat
• verified the top-level notebook sequence is exactly 00 through 13
• verified every syllabus exercise/solution link resolves and its row number matches its filename
• verified the test ladder matches the filesystem order
• verified all numbered notebook filename references resolve
• confirmed no old renamed basename remains in the repository
• git diff --check

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