test(coverage): add router coverage suite — 79% → 93%

[orvi2014]

400 tests, 0 warnings. New test_baar_router_coverage.py covers:

• chat(), run(), stream_chat() happy paths + kill-switch + failover
• achat(), arun(), astream_chat() async equivalents
• value gate: reject, downgrade, clamp, UserWarning paths
• domain model overrides (string and tuple forms)
• telemetry file creation and OSError handling
• main.py entrypoint (0% → 100%)
• token_counter fallback, _check_litellm_version, retry helpers
• BAARConfig validation edge cases

Description

Please include a summary of the change and which issue it addresses.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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✅ All modified and coverable lines are covered by tests.

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[orvi2014]

Closing — the only change in this PR (tests/test_baar_router_coverage.py) was already merged to main via PR #25. Nothing new to add.