fix(ln): allow symlinks in ReadWrite RealFs mounts#1251
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Symlink creation was unconditionally blocked in RealFs. Now allowed in ReadWrite mode with containment checks: absolute targets are rejected, relative targets are validated to resolve within the mount root on disk. PosixFs no longer normalizes symlink targets (which would convert relative paths to absolute, breaking containment). Closes #1158
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Summary
Test plan
/etc/passwd) is blocked../../../../etc/passwd) is blockedcargo clippycleanCloses #1158