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Add root-confined writable dirfs mode - #39
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Closes #30.
Adds an explicit writable mode to the root-confined directory FUSE view. It supports create, write, truncate, rename, unlink, mkdir, rmdir, and fsync while retaining
O_NOFOLLOWpath walks andnodev,nosuid,noexecmount options. New files and directories use safe modes, and chmod masks file execute bits. Documents the persistence exception for Read & write sharing with Allow changes.Validation:
nix build .#docker-vm; focused dirfs unit tests (5 passing);./tests/validation.sh; live RW-tier Docker checks for EROFS without Allow changes, host-owned nonexecutable writes with it, and symlink escape refusal.