[marshal] Add Regression Test for Pending Acks

[patrick-ogrady]

Related: #3828

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	3bc4421	May 21 2026, 08:18 AM

[github-actions]

Benchmark results

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✅ PASSED: No benchmark exceeded the regression threshold.

Benchmark comparison table

Benchmark	Baseline (main)	Current	Delta	Threshold	Status
qmdb::merkleize/variant=any::unordered::fixed::mmr keys=10000 ch=false sync=false	1.565 ms	1.567 ms	+0.18%	10.00%	✅ PASS
qmdb::merkleize/variant=current::ordered::fixed::mmb chunk=256 keys=10000 ch=true sync=false	3.028 ms	3.034 ms	+0.21%	10.00%	✅ PASS

Baseline commit(s): 34f1f8e40310

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Latest commit:	3bc4421
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[codecov]

Codecov Report

❌ Patch coverage is 97.18310% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.77%. Comparing base (c0f7a04) to head (3bc4421).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
consensus/src/marshal/standard/mod.rs	97.16%	5 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main    #3848      +/-   ##
==========================================
- Coverage   95.77%   95.77%   -0.01%     
==========================================
  Files         486      486              
  Lines      199578   200338     +760     
  Branches     4851     4858       +7     
==========================================
+ Hits       191147   191870     +723     
- Misses       6806     6837      +31     
- Partials     1625     1631       +6     

Files with missing lines	Coverage Δ
consensus/src/marshal/core/actor.rs	92.47% <100.00%> (+<0.01%)	⬆️
consensus/src/marshal/standard/mod.rs	97.41% <97.16%> (+0.01%)	⬆️

... and 12 files with indirect coverage changes

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