Store partial chunk writes as merge deltas instead of full-chunk rewrites

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Project	Deployment	Actions	Updated (UTC)
zerofs	Ready	Preview, Comment	Jun 29, 2026 3:44pm
zerofs-landing	Ready	Preview, Comment	Jun 29, 2026 3:44pm

[codecov]

Codecov Report

❌ Patch coverage is 82.76762% with 66 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.30%. Comparing base (68ad84d) to head (16a61fd).

Files with missing lines	Patch %	Lines
zerofs/src/replication/transport.rs	74.73%	24 Missing ⚠️
zerofs/src/db.rs	23.52%	13 Missing ⚠️
zerofs/src/cli/init.rs	0.00%	11 Missing ⚠️
zerofs/src/fs/store/chunk_merge.rs	94.58%	11 Missing ⚠️
zerofs/src/cli/server.rs	14.28%	6 Missing ⚠️
zerofs/src/cli/compactor.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
+ Coverage   69.09%   69.30%   +0.21%     
==========================================
  Files          72       73       +1     
  Lines       22657    23021     +364     
==========================================
+ Hits        15655    15955     +300     
- Misses       7002     7066      +64     

Files with missing lines	Coverage Δ
zerofs/src/fs/mod.rs	89.98% <100.00%> (+0.02%)	⬆️
zerofs/src/fs/stats.rs	100.00% <100.00%> (ø)
zerofs/src/fs/store/chunk.rs	88.71% <100.00%> (+1.05%)	⬆️
zerofs/src/replication/tail.rs	100.00% <ø> (ø)
zerofs/src/rpc/server.rs	72.31% <100.00%> (+0.05%)	⬆️
zerofs/src/cli/compactor.rs	0.00% <0.00%> (ø)
zerofs/src/cli/server.rs	19.97% <14.28%> (+<0.01%)	⬆️
zerofs/src/cli/init.rs	0.00% <0.00%> (ø)
zerofs/src/fs/store/chunk_merge.rs	94.58% <94.58%> (ø)
zerofs/src/db.rs	72.16% <23.52%> (-1.92%)	⬇️
... and 1 more

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