fix(llm_agent): prevent TypeError when agent.pos is None in _build_observation()

[abikooo]

Fixes #244

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[souro26]

please add the tests in the existing test file instead of a new one

[abikooo]

thanks for the review, @souro26 . both points addressed. refactored to a single early return at the top and moved tests into test_llm_agent.py. all checks passing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.83%. Comparing base (09f14bb) to head (4e30f57).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
- Coverage   91.88%   91.83%   -0.06%     
==========================================
  Files          19       19              
  Lines        1627     1629       +2     
==========================================
+ Hits         1495     1496       +1     
- Misses        132      133       +1     

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[wang-boyu]

Thanks for the fix. main is merged into this branch to solve conflicts. Merging now.