removed MemoryTransport

[pompon0]

TCP transport is good enough to use in tests. Using the TCP transport in all tests significantly improves the transport logic coverage.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Sep 30, 2025, 12:43 PM

[codecov]

Codecov Report

❌ Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.96%. Comparing base (456f01e) to head (c27efde).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/p2p/conn/connection.go	0.00%	2 Missing and 1 partial ⚠️
internal/p2p/transport_mconn.go	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
- Coverage   57.09%   56.96%   -0.13%     
==========================================
  Files         255      254       -1     
  Lines       33956    33815     -141     
==========================================
- Hits        19386    19264     -122     
+ Misses      13029    13008      -21     
- Partials     1541     1543       +2     

Files with missing lines	Coverage Δ
internal/blocksync/pool.go	80.00% <ø> (-0.86%)	⬇️
internal/p2p/router.go	77.48% <ø> (-1.95%)	⬇️
internal/p2p/transport_mconn.go	84.18% <95.45%> (+2.16%)	⬆️
internal/p2p/conn/connection.go	79.54% <0.00%> (-0.23%)	⬇️

... and 10 files with indirect coverage changes

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