[storage] in-mem MMB implementation

[roberto-bayardo]

Implementation of a merkle mountain belt analog to mmr/mem.rs.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	97c8978	Mar 03 2026, 11:35 PM

[codecov]

Codecov Report

❌ Patch coverage is 91.26697% with 193 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.79%. Comparing base (c0b0bbf) to head (60b426b).

Files with missing lines	Patch %	Lines
storage/src/mmb/mem.rs	95.09%	48 Missing ⚠️
storage/src/merkle/position.rs	63.70%	45 Missing ⚠️
storage/src/mmb/iterator.rs	91.73%	21 Missing ⚠️
storage/src/merkle/location.rs	83.73%	20 Missing ⚠️
storage/src/merkle/mod.rs	0.00%	18 Missing ⚠️
storage/src/mmb/mod.rs	62.96%	10 Missing ⚠️
storage/src/mmb/hasher.rs	87.03%	7 Missing ⚠️
storage/src/merkle/proof.rs	83.78%	6 Missing ⚠️
storage/src/qmdb/sync/target.rs	76.47%	4 Missing ⚠️
storage/src/journal/authenticated.rs	95.52%	3 Missing ⚠️
... and 6 more

@@            Coverage Diff             @@
##             main    #3280      +/-   ##
==========================================
- Coverage   93.86%   93.79%   -0.08%     
==========================================
  Files         419      425       +6     
  Lines      142553   143543     +990     
==========================================
+ Hits       133808   134634     +826     
- Misses       8745     8909     +164     

Files with missing lines	Coverage Δ
storage/src/lib.rs	0.00% <ø> (ø)
storage/src/mmr/hasher.rs	97.54% <100.00%> (ø)
storage/src/mmr/iterator.rs	100.00% <100.00%> (+0.59%)	⬆️
storage/src/mmr/journaled.rs	97.16% <100.00%> (+0.13%)	⬆️
storage/src/mmr/proof.rs	98.57% <100.00%> (-0.06%)	⬇️
storage/src/mmr/verification.rs	96.52% <100.00%> (ø)
storage/src/qmdb/any/db.rs	98.41% <100.00%> (ø)
storage/src/qmdb/any/mod.rs	99.68% <100.00%> (-0.01%)	⬇️
storage/src/qmdb/any/operation/mod.rs	77.00% <100.00%> (-0.23%)	⬇️
storage/src/qmdb/any/operation/variable.rs	96.96% <100.00%> (+12.35%)	⬆️
... and 40 more

... and 2 files with indirect coverage changes

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