Ignore recent file moves in git-blame

[rolandwalker]

No description provided.

[github-actions]

No blocking findings.

I reviewed the only PR change (.git-blame-ignore-revs added) and found no correctness regressions or security concerns. This file only affects local git blame behavior and does not affect runtime code paths.

Testing: no additional tests needed for this change.
Optional follow-up: ensure contributors have git config blame.ignoreRevsFile .git-blame-ignore-revs set so the file is actually used.