## 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
## What changed
- Add `codex exec-server forward --connect ws://HOST:PORT` to register an
existing WebSocket exec-server as a remote environment.
- Open a separate destination WebSocket for each authenticated Noise relay
stream and forward complete payloads unchanged in both directions.
- Preserve large messages through WebSocket fragmentation and coordinate
disconnects, close acknowledgements, and pending output delivery.
## Testing
- Cover CLI validation, opaque payload forwarding, disconnect handling, and
destination close behavior.
- Verify commands and large file transfers through the complete relay and
forwarding path.
GitOrigin-RevId: 6e2dccff05b9e3571865611f4d432b0e2b4cdbac
