chore(mix): truncate exponential delay to practical limits based on probablity

[chaitanyaprem]

Summary

Current exponential delay strategy can cause large range of delays which might be impractical to use.
e.g max delay can reach 65535msec which is almost a minute.

In order to avoid that and truncate delays a probability config is being introduced.
This is also to keep in line with what is explained here

Affected Areas

• Other
  This just affects the delay generated from meanDelay for intermediate nodes to a limit that is more practical.

Compatibility & Downstream Validation

Provided a default value of probability so no breakage expected.

Reference PRs / branches / commits demonstrating successful integration:

• Waku:
  updated libwaku API to integrate with logos chat poc for mix integration logos-messaging/logos-delivery#3679

Impact on Library Users

Any mix protocol users using exponentialDelayStrategy would now get practically truncated delays.
Probability used for truncation is configurable but can be left to default.

Risk Assessment

None

References

Mix protocol spec delay strategy section.

[Copilot]

Pull request overview

This PR introduces a practical truncation mechanism for the exponential delay strategy in the Mix protocol to prevent impractically long delays. The implementation adds a configurable negligibleProb parameter that truncates the exponential distribution's tail at -mean*ln(negligibleProb), limiting maximum delays while preserving mixing properties. With the default value of 1e-6, maximum delays are capped at approximately 13.8 times the mean delay instead of the previous theoretical maximum of 65,535ms.

Changes:

• Added negligibleProb parameter to ExponentialDelayStrategy with default value of 1e-6
• Modified delay generation to truncate at computed maximum based on negligible probability threshold
• Added comprehensive tests to verify truncation behavior with both default and custom probability values

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
libp2p/protocols/mix/delay_strategy.nim	Adds negligibleProb field and parameter, implements truncation logic in generateForIntermediate method, includes validation and documentation
tests/libp2p/mix/test_delay_strategy.nim	Adds two new tests verifying truncation at default and custom negligibleProb thresholds with 10,000 iterations each

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[github-actions]

🏁 Performance Summary

Commit: d581592b968c4545e83f4316caae447eb52717c7

Scenario	Nodes	Total messages sent	Total messages received	Latency min (ms)	Latency max (ms)	Latency avg (ms)
❌ Base Test (QUIC)	10	100	621	126.271	13339.964	5616.611
✅ Base Test (TCP)	10	100	900	0.314	2.451	1.272

📊 View Container Resources in the Workflow Summary

Latency History

_{🔵 Min • 🟢 Avg • 🔴 Max}

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Loading

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.74%. Comparing base (dd27a08) to head (d581592).

Files with missing lines	Patch %	Lines
libp2p/protocols/mix/delay_strategy.nim	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2120      +/-   ##
==========================================
+ Coverage   72.70%   72.74%   +0.03%     
==========================================
  Files         153      153              
  Lines       18859    18863       +4     
  Branches       19       19              
==========================================
+ Hits        13711    13721      +10     
+ Misses       5148     5142       -6     

Files with missing lines	Coverage Δ
libp2p/protocols/mix/delay_strategy.nim	73.52% <60.00%> (+0.19%)	⬆️

... and 8 files with indirect coverage changes

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[richard-ramos]

Probably can be removed as the name of the variables are practically the same as those from the formula

Suggested change

# maxDelay = -mean * ln(negligibleProb)

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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