fix!: prevent path traversal in FilenameSchema#25
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Basename filenames before stripping reserved chars so "../" and absolute
paths can't escape cwd via saveResults / SnapshotAPI.download.
BREAKING CHANGE: filenames passed to saveResults and snapshot download
are now reduced to their final path segment. Callers relying on nested
subdirectory paths (e.g. "output/data.json") will now write to the
basename only ("data.json") in the working directory.
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Basename filenames before stripping reserved chars so "../" and absolute paths can't escape cwd via saveResults / SnapshotAPI.download.
BREAKING CHANGE: filenames passed to saveResults and snapshot download are now reduced to their final path segment. Callers relying on nested subdirectory paths (e.g. "output/data.json") will now write to the basename only ("data.json") in the working directory.