docs: add Git notes

[Planeshifter]

• b2e0f83: typo in subject — arrest/is-equal-uint64array should be assert/is-equal-uint64array (PR-URL feat: add arrest/is-equal-uint64array #15616 verified as the merging PR)
• 470ed70: malformed subject — backtick placed before update instead of around the package path (PR-URL refactor!: update fft/base/fftpack/float32/cosqi to use integer array view #15329 verified as the merging PR)

Note: the two commits are signed off as Claude <noreply@anthropic.com> rather than Philipp Burckhardt, because the sandbox git identity was not configured; reviewer may want to amend before merge.

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https://claude.ai/code/session_01759n2H1N2fqobWJKVt13Ah

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[kgryte]

We need to update the OP according to the comment above.