[marshal] Assert AncestryStream Correctness (+ Fix Reshare Example)

[patrick-ogrady]

Related: #3828

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	3409e8a	May 20 2026, 08:27 PM

[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	1.555 ms	1.571 ms	+1.04%	10.00%	✅ PASS
qmdb::merkleize/variant=current::ordered::fixed::mmb chunk=256 keys=10000 ch=true sync=false	3.044 ms	3.100 ms	+1.83%	10.00%	✅ PASS

Baseline commit(s): 25bd84194fab

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[codecov]

Codecov Report

❌ Patch coverage is 96.93878% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (marshal-state-sync@d917919). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
consensus/src/marshal/ancestry.rs	94.44%	3 Missing ⚠️

@@                  Coverage Diff                  @@
##             marshal-state-sync    #3845   +/-   ##
=====================================================
  Coverage                      ?   95.75%           
=====================================================
  Files                         ?      474           
  Lines                         ?   193419           
  Branches                      ?     4695           
=====================================================
  Hits                          ?   185205           
  Misses                        ?     6625           
  Partials                      ?     1589           

Files with missing lines	Coverage Δ
consensus/src/marshal/coding/mod.rs	96.31% <100.00%> (ø)
consensus/src/marshal/coding/variant.rs	95.52% <100.00%> (ø)
consensus/src/marshal/config.rs	100.00% <ø> (ø)
consensus/src/marshal/standard/mod.rs	96.87% <100.00%> (ø)
consensus/src/marshal/standard/variant.rs	100.00% <100.00%> (ø)
consensus/src/simplex/mod.rs	98.48% <100.00%> (ø)
consensus/src/marshal/ancestry.rs	92.30% <94.44%> (ø)

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