fix(xai): migrate current model config slots

[ayooooo123]

Summary

• scan current Hermes model config slots (model.default / model.model) for retired xAI model IDs
• support root string model: xai/grok-3 configs during migration
• preserve explicit x-ai/ and xai/ provider prefixes when applying replacements

Test Plan

• PYTHONPATH=$PWD python -m pytest tests/hermes_cli/test_xai_retirement.py tests/hermes_cli/test_migrate_xai.py -q
• PYTHONPATH=$PWD python -m pytest tests/hermes_cli/test_xai_retirement.py tests/hermes_cli/test_migrate_xai.py tests/hermes_cli/test_auth_xai_oauth_provider.py tests/hermes_cli/test_xai_oauth_pkce_token_exchange.py tests/hermes_cli/test_tools_config.py tests/hermes_cli/test_runtime_provider_resolution.py -q
• git diff --check origin/main..HEAD
• static added-line scan for secrets / shell injection / eval / pickle / SQL string formatting: no findings
• independent reviewer: passed; no blocking security or logic issues

[teknium1]

Thanks for covering the active primary-model config shape; that gap is real on current main.

Problems

• The new model.model scan should follow the current resolver precedence. hermes_cli/runtime_provider.py:283-289 treats model.model as a fallback only when model.default is absent, and hermes_cli/config.py:6565-6575 canonicalizes the same default > model > name order. Scanning both can migrate an inactive alias and, for a non-reasoning alias, write reasoning_effort: none beside the active default.

Suggested changes

• Make the legacy model.model check conditional on an absent/empty model.default, and add the corresponding precedence regression test. The root-string and provider-prefix apply cases can remain.

Automated hermes-sweeper review.

[teknium1]

model.model is a fallback alias, not a second active model slot: runtime_provider._get_model_config() uses it only when model.default is empty. Please make this an elif/fallback check and test that a valid default plus a retired legacy alias does not generate an alias migration or set reasoning_effort on the active model block.