fix(win): wide-path canonicalization — drop ANSI _access/_fullpath #731

Job	Run time
changes	3s
lint / lint	5m 14s
security / codeql-gate	38m 9s
security / license-gate	3m 8s
security / security-static	29s
pr-smoke (ubuntu-latest)	4m 4s
pr-smoke (windows-latest)	6m 54s
pr-smoke (macos-14)	3m 8s
test / test-tsan	13m 1s
test / test-windows-guards	7m 26s
test / setup-matrix	3s
test / test-windows (windows-latest, CLANG64, x86_64)	35m 15s
test / test-unix (ubuntu-latest, gcc, g++)	15m 39s
test / test-unix (macos-14, cc, c++)	10m 41s
test / test-unix (macos-15-intel, cc, c++)	18m 47s
test / test-unix (ubuntu-24.04-arm, gcc, g++)	1h 17m 12s
ci-ok	3s
	3h 59m 16s

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