fix(agent): honor auxiliary task extra_body

[VrtxOmega]

Summary

• make get_auxiliary_extra_body() accept an optional auxiliary task key
• merge auxiliary.<task>.extra_body into direct auxiliary callers while preserving legacy no-task Nous Portal tags
• pass task keys from profile describer, kanban specify/decompose, and goal judge
• add focused regression coverage for the helper and profile describer passthrough

Fixes #35566.

Notes

This is intentionally narrower than the auxiliary fallback cluster in #32411: it only fixes task-specific extra_body passthrough for the existing direct auxiliary callers.

Verification

PYTHONPATH=. uv run --frozen --extra dev pytest tests/agent/test_auxiliary_client.py::TestAuxiliaryTaskExtraBody tests/hermes_cli/test_profile_describer.py -q
PYTHONPATH=. uv run --frozen --extra dev pytest tests/hermes_cli/test_kanban_specify.py tests/hermes_cli/test_kanban_decompose.py tests/hermes_cli/test_goals.py -q
uv run --frozen --extra dev ruff check agent/auxiliary_client.py hermes_cli/profile_describer.py hermes_cli/kanban_specify.py hermes_cli/kanban_decompose.py hermes_cli/goals.py tests/agent/test_auxiliary_client.py tests/hermes_cli/test_profile_describer.py
git diff --check

[VrtxOmega]

Closing as duplicate of #35570 — same get_auxiliary_extra_body(task=...) fix for #35566. Thanks.