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## Why An `apply_patch` path can be replaced with a symlink after verification, allowing an unsandboxed patch operation to reach a different file than the one that was approved. ## What changed - Add `follow_symlinks` options to executor filesystem reads, writes, metadata lookups, directory creation, and removal, including the corresponding `followSymlinks` protocol fields. - Implement no-follow filesystem operations on Unix and Windows that reject links in any path component and restrict file access to regular files. - Run `apply_patch` with symlink traversal disabled when an otherwise-required sandbox is bypassed, while retaining the existing follow-symlink default for standalone callers. ## Testing - Cover leaf and ancestor symlinks across patch add, update, delete, and move operations, including a path swap after verification. - Exercise local and remote no-follow filesystem behavior, concurrent directory creation, special-file rejection, and Windows reparse points. GitOrigin-RevId: 43fd479084891493ce13564fbd894b98f329c6dd