test: cover connect lookup option

[vibhor-aggr]

Summary

• add direct regression coverage that object-form connect.lookup is forwarded to the built connector
• document the object-form connect.lookup pattern in Client docs

Refs: #886

Verification

• node --expose-gc --test --test-name-pattern "passes lookup from connect options" test/client.js
• ./node_modules/.bin/borp --timeout 180000 --expose-gc -p test/client.js
• npm run lint -- test/client.js
• git diff --check

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.24%. Comparing base (ac5394b) to head (1521132).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5411      +/-   ##
==========================================
- Coverage   93.25%   93.24%   -0.01%     
==========================================
  Files         110      110              
  Lines       36825    36825              
==========================================
- Hits        34340    34339       -1     
- Misses       2485     2486       +1     

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