[marshal] Restore AncestryStream

[patrick-ogrady]

Related: #3796
Alternative: #3835

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	commonware-mcp	3dcd115	May 20 2026, 06:06 AM

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Latest commit:	3dcd115
Status:	✅  Deploy successful!
Preview URL:	https://e11cd136.monorepo-eu0.pages.dev
Branch Preview URL:	https://switch-to-ancestry-stream.monorepo-eu0.pages.dev

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[github-actions]

Benchmark results

Tip

✅ 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	1.567 ms	1.574 ms	+0.45%	10.00%	✅ PASS
qmdb::merkleize/variant=current::ordered::fixed::mmb chunk=256 keys=10000 ch=true sync=false	3.100 ms	3.036 ms	-2.06%	10.00%	✅ PASS

Baseline commit(s): 14a016a55f43

[codecov]

Codecov Report

❌ Patch coverage is 95.76271% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.74%. Comparing base (14a016a) to head (3dcd115).

Files with missing lines	Patch %	Lines
consensus/src/marshal/coding/mod.rs	96.42%	1 Missing and 1 partial ⚠️
consensus/src/marshal/standard/mod.rs	94.73%	1 Missing and 1 partial ⚠️
consensus/src/marshal/mocks/verifying.rs	75.00%	1 Missing ⚠️

@@           Coverage Diff            @@
##             main    #3838    +/-   ##
========================================
  Coverage   95.73%   95.74%            
========================================
  Files         473      473            
  Lines      192489   192600   +111     
  Branches     4666     4668     +2     
========================================
+ Hits       184280   184400   +120     
+ Misses       6636     6631     -5     
+ Partials     1573     1569     -4     

Files with missing lines	Coverage Δ
consensus/src/lib.rs	0.00% <ø> (ø)
consensus/src/marshal/ancestry.rs	95.00% <100.00%> (+0.12%)	⬆️
consensus/src/marshal/core/mailbox.rs	92.49% <100.00%> (+0.11%)	⬆️
consensus/src/marshal/mocks/verifying.rs	89.61% <75.00%> (ø)
consensus/src/marshal/coding/mod.rs	95.97% <96.42%> (+0.01%)	⬆️
consensus/src/marshal/standard/mod.rs	96.74% <94.73%> (-0.04%)	⬇️

... and 7 files with indirect coverage changes

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