fix: keep non-ASCII paths unescaped in the extracted diff

[vitali87]

Problem

With git's default core.quotePath=true, any non-ASCII path in git diff output is octal-escaped and quoted: +++ "b/new file \303\274.txt". unidiff cannot parse that for new/deleted files (DiffParseError: Target without source), so pr-split split aborts with no plan; for modified files it parses but records the literal quoted string as the path, so materialisation later fails with fatal: path '"a/\303\274n\303\257.txt"' does not exist. Found by the end-to-end hunt (ünï.txt, new file ü.txt).

Fix

extract_diff runs git -c core.quotePath=false diff …. Verified end to end: modified, added, deleted, and nested (dir ü/日本語.txt) non-ASCII paths round-trip through extract → parse → branch creation, and the sub-PR tree is byte-identical to dev; also checked under LANG=C. git show, git add --, and the worktree writes all take the raw path fine.

Tests

Real-git test with a modified ünï.txt and an added new file ü.txt (fails on base); the argv assertion updated.

Local review: 5/5. 464 tests pass, ruff clean. Stacked on #70 (stack #81) because it edits the same git diff invocation.

Follow-up (pre-existing): paths containing ", \, tab or newline are still C-quoted regardless of core.quotePath.

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