fix: restore buffering with strategic flushes

[mccutchen]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.13%. Comparing base (6f40d29) to head (344f0ba).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
websocket.go	66.66%	0 Missing and 2 partials ⚠️
proto.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   77.74%   78.13%   +0.38%     
==========================================
  Files           2        2              
  Lines         373      375       +2     
==========================================
+ Hits          290      293       +3     
+ Misses         61       60       -1     
  Partials       22       22              

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