test(pubsub): lower flaky high-volume test to 500 messages

[leshy]

test_high_volume_messages was flakey

[greptile-apps]

Greptile Summary

This PR reduces the flaky pubsub high-volume test size.

• Updates the test description to call it moderate-volume coverage.
• Lowers the message count from 5000 to 500.
• Keeps the same publish-and-receive assertion flow.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
dimos/protocol/pubsub/test_spec.py	Updates the pubsub high-volume test to use 500 messages and matching comments.

_{Reviews (2): Last reviewed commit: "Merge branch 'main' into fix/ivan/flakey..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main    #2766      +/-   ##
==========================================
- Coverage   72.08%   72.07%   -0.01%     
==========================================
  Files         941      941              
  Lines       84224    84224              
  Branches     7650     7650              
==========================================
- Hits        60709    60706       -3     
- Misses      21472    21473       +1     
- Partials     2043     2045       +2     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	64.46% <0.00%> (+<0.01%)	⬆️
OS-ubuntu-latest	67.03% <0.00%> (-0.01%)	⬇️
Py-3.10	67.02% <0.00%> (+<0.01%)	⬆️
Py-3.11	67.02% <0.00%> (-0.01%)	⬇️
Py-3.12	67.02% <0.00%> (+<0.01%)	⬆️
Py-3.13	67.02% <0.00%> (+<0.01%)	⬆️
Py-3.14	67.03% <0.00%> (+<0.01%)	⬆️
Py-3.14t	67.02% <0.00%> (-0.01%)	⬇️
SelfHosted-Large	30.20% <0.00%> (ø)
SelfHosted-Linux	38.03% <100.00%> (ø)
SelfHosted-macOS	36.32% <0.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
dimos/protocol/pubsub/test_spec.py	90.47% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[spomichter]

Approving since change makes sense but also unsure what the test does and hard coding 5k messages seems arbitrary as we move to more transports.

[leshy]

Approving since change makes sense but also unsure what the test does and hard coding 5k messages seems arbitrary as we move to more transports.

Thinking was for a local transport if you cannot exchange 5k small messages it's not a functional transport