chore: address TODO comments

[azkrishpy]

Issue #, if available: N/A

Description of changes:

Base branch for the TODO-cleanup chore stack. Each stacked PR merges here; this merges to main once as a single change.

Carries only test-side housekeeping: drops an unused mock-server field and its trailing whitespace, and raises the connection-monitor test interval from 1 to 2 seconds because the Java binding requires at least 2, which also matches the value the adjacent validity test already uses.

No library code touched.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.02%. Comparing base (2b563f8) to head (b32d9ee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
+ Coverage   79.84%   80.02%   +0.18%     
==========================================
  Files          28       28              
  Lines       12105    12105              
==========================================
+ Hits         9665     9687      +22     
+ Misses       2440     2418      -22     

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