fix(title): honor configured auxiliary timeout

[shandian64]

Summary

• stop forcing title generation to pass the 30s default timeout into call_llm
• let call_llm(task="title_generation") resolve auxiliary.title_generation.timeout from config when no explicit timeout is provided
• add coverage for default-config timeout delegation and explicit timeout overrides

Fixes #41812.

Tests

• python -m pytest -o addopts= -p no:timeout tests/agent/test_title_generator.py tests/hermes_cli/test_aux_config.py::test_title_generation_present_in_default_config
• python -m py_compile agent/title_generator.py

[kshitijk4poor]

Superseded by #56322, which carries your commit verbatim (authorship preserved) rebased onto current main (kept both your timeout tests and main's newer language tests). Your one-line fix (generate_title timeout default 30.0 -> Optional[None] so call_llm resolves auxiliary.title_generation.timeout) was the cleanest, creep-free fix in a 4-PR cluster for #32729. Phase 2c: 0 Critical, 25 tests pass. Full credit to you. Closing in favor of #56322.