Native kernel client

[Barre]

Adds a native Rust Linux filesystem client for ZeroFS, supporting Linux 6.18+ on x86_64 and arm64. Includes shared 9P codecs, reconnect correctness fixes, and DKMS packaging.

[github-actions]

Cloudflare Pages preview: https://c5c3faaa.zerofs.pages.dev

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.56%. Comparing base (d2bc8b9) to head (8f77faa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #560      +/-   ##
==========================================
+ Coverage   81.39%   82.56%   +1.17%     
==========================================
  Files          97       97              
  Lines       43094    45892    +2798     
==========================================
+ Hits        35075    37891    +2816     
+ Misses       8019     8001      -18     

Files with missing lines	Coverage Δ
zerofs/src/cli/server.rs	24.92% <ø> (-0.06%)	⬇️
zerofs/src/fs/inode.rs	93.99% <ø> (+1.30%)	⬆️
zerofs/src/fs/ops/create.rs	94.78% <ø> (+0.37%)	⬆️
zerofs/src/fs/ops/io.rs	97.82% <ø> (+0.16%)	⬆️
zerofs/src/fs/ops/link.rs	91.50% <ø> (+1.83%)	⬆️
zerofs/src/fs/ops/lookup.rs	97.58% <ø> (+0.14%)	⬆️
zerofs/src/fs/ops/remove.rs	95.80% <ø> (+2.89%)	⬆️
zerofs/src/fs/ops/rename.rs	92.85% <ø> (+4.57%)	⬆️
zerofs/src/fs/ops/setattr.rs	81.16% <ø> (+19.03%)	⬆️
zerofs/src/fs/permissions.rs	90.52% <ø> (+5.64%)	⬆️
... and 8 more

... and 1 file with indirect coverage changes

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